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Factors to Check Before Buying Cell Phones in Bulk

 

Life in the digital age will practically come to a standstill without its most prominent tool: the cell phone. Not having one in your pocket or bag can make you feel stranded on a desert island with severely hampered access to resources and services. 

 

Technology keeps improving these handheld devices' capabilities, so it has become common practice to go for the latest and greatest to take advantage of all those developments. This leaves plenty of moderately used phones on the second-hand market waiting to be nabbed.

 

You can buy cell phones in bulk due to the cost advantages they offer. They can be a good bargain while giving access to good enough technology. These also apply if you're going for new pieces as well.

 

What to Watch Out For

The demand for bulk buying of phones has created a big market for it and attracted a bunch of scammers as well. When you buy cell phones in bulk, you must be cautious of the many ways you could get scammed and cheated. Learning about the methods employed will help to avoid falling for these schemes.

 

Near-Perfect Fakes

Certain phones like the iPhone have a big following behind them, with people lining up for days to buy the latest model. Such demand creates a great opportunity for scammers to create fakes that can be made to pass off as the original.

 

As technology improved, scammers got better tools to improve these duplicitous phones' looks, feel, and function, making them practically indistinguishable from the original. And they target the bulk phone market as this is where they get the most margins.

 

One way to beat these scammers is to tag along or consult an expert who knows how to tell the real ones from the fakes. Pulling out random samples and examining them for details like model number, batch number, manufacturer's information, etc., will help tell them apart.

 

The other way is to purchase from an authorized reseller. That way, you know you're getting the real deal, with the paperwork to show for it and guard you against any mishaps or failures if they occur.

 

Stolen Sets

As the value of phones in our lives went up, so did their value as an item to be picked from your pockets. Ironically, the second-hand market is what primarily drives the theft of phones, as good models can fetch good money in the gray zones of the trade. It could very well happen that your bunch of used phones could contain some stolen ones, or the entire bunch could be full of them.

 

One report found that 1 in 10 Americans are victims of phone theft. That's a whopping ten percent of the phones in use that could potentially end up on your lap. And if that wasn't enough, you could end up facing the wrath of authorities should they come across you with even one such phone.

 

Prevent this by insisting on the original or copy of the purchase invoice of the phones. Read through it/them thoroughly and ascertain details like time of purchase, cost, the authenticity of the place of purchase, warranty details, IMEI number(s), etc. If the phone is screen-locked or has non-stock content, then it's guaranteed to be a stolen item.

 

External/Internal Damages

It is considered a given for second-hand phones to have some form of damage. These could be upfront or hidden within the casing. Depending on the severity of the damage, they can compromise the phone's functionality and thus value by a considerable margin.

 

Keenly examine the product for common damages like scratches and dents. These happen due to falls and by being placed amidst sharp objects in bags and pockets. Minor, superficial ones are not much of a concern, but large and deep ones can indicate significant damage to the innards of the handset. Scratches on the screen and camera lens can be a deal-breaker.

 

Certain codes are available, which can be entered into the device's dial pad, which will check the internals for their proper functioning. Like a chip, camera, screen, battery, speakers, ports, etc., most components will be evaluated and reported on, so you'll know the phone's actual status.

 

Cost

The costs of bulk purchases can vary by the make, vendor, time, place, condition, etc. Ask around to get an idea of the average going rate, and zero-in on the cheapest seller who also offers a quality guarantee. Don't hesitate to negotiate to bring down the price further.

 

Whether to sell or use, you can buy cell phones in bulk with the right precautions for a great bargain and ride the wave of the convenience they have to offer.


How Resistors Work in Your Smartphone and Home

 

It helps to know the different resistor types and their uses. Tech companies use them in smartphones, TVs, radios, and every device in your home. Choosing the wrong type could lead to a product malfunctioning inside someone's pocket in an airplane.

 

This article aims to teach you all about their merits, demerits, and popular applications. You'll also find out more about the most common ones.

 

Here's everything you need to know about these tiny but important pieces of tech:

 

What Are Resistors?

There are different types of resistors, but most are two-terminal electrical components that passively limit current or reduce voltage. Measured in Ohms (Ω), they work alongside op-amps or controllers to complete various operations. Many engineers use them to change properties or measure current within a circuit.

 

They vary in power rating, size, performance, and overall cost. Chip surface-mount (SMD), current sense, potentiometers, thermistors, through-hole, and wire-wound are the most common. Below is a little more detail about these versions.

 

1. Chip SMD Resistors

SMDs are tiny and perfect for printed circuit boards (PCBs). Smartphones, laptops, and most silicon-printed circuits use them for operations that ensure signals are right at all times.

 

Chip SMDs come in two different types:

  • Thin Film

Used in high precision applications like audio, medical, or testing equipment, they provide low temperature-coefficients and variations. They are quiet and rather pricey.

  • Thick Film

Found in most hardware, they have higher variations, temperature coefficients, and are noisier than their counterparts. Companies prefer using thick film in microwaves or desktop computers.

 

2. Current Sense Resistors

Current sense resistors (aka shunts) gauge the current flow within a circuit and convert the voltage into a readable format. They minimize power consumption and reduce the risks of a short-circuit. Musicians and music producers often connect them to amplifiers to minimize noise's impact at certain resolution levels.

 

3. Potentiometers

Trimmer potentiometers (aka trimpots) are small variable resistors that are PCB mountable and screwdriver adjustable. They can be SMD or through-hole with side or top adjustment. Trimpots are single or multi-turn and used in amplifier gain control or circuit tuning up to 25 times.

 

4. Thermistors

Thermistors lower resistance with temperature, making them ideal for sensors between -55C and 200C. They offer a great range of resistance, which is why companies usually install them in household appliances like refrigerators and ovens.

 

5. Through-hole Resistors

You can hand-solder through-hole resistors into a prototyping board or PCB or stick it into a breadboard, and they are long, pliable leads.

 

There are multiple types:

 

Carbon Film

Producers use them in high voltage power supplies, radar, x-rays, and laser technology. Metal film replaced them in most areas.

 

Metal Film

Metal film resistors have lower variations in resistance values and higher stability. Cheaper and offering better performance, computer and tech companies use them in desktops and gaming consoles.

 

Carbon Composition

These were popular in the 70s, but carbon and metal film replaced them. Today, we use them in high voltage power supplies (e.g., generators) and welding equipment.

 

Metal Oxide

Created with a metal film oxide wrapped around a ceramic rod, they were the first alternatives to carbon composition resistors. Since then, metal film resistors have replaced them.

 

6. Wire-wound

Wire-wound resistors provide high power ratings at high temperatures. Made of high-resistance wires wrapped around an insulating core, they offer better long-term usage. They're bigger and more expensive than others and, therefore, more commonly used in circuit breakers and fuses.

 

While you might not be able to replace most without some electronic knowledge, you can swap a fuse in your circuit breaker quite easily.


snapdragon

 

We have reached the end of 2020. This year brought so many new technologies and innovations in the smartphone industry and now we can expect some amazing flagship iterations in the next year. In 2021, most companies are going to update their processing systems to more powerful Qualcomm Snapdragon 888 Soc. This has begun and hence, we are going to look at the list of contenders for the next year's flagship that will be powered by the Snapdragon 888. Chinese smartphone manufacturers are at the top of this list. In fact, Qualcomm itself has named the companies which show how much American MNC values the Chinese vendors. Anyway, the list includes the company names like Xiaomi, Vivo, Oppo, OnePlus, etc.

 

The first phone that confirmed the use of Snapdragon 888 is the Xiaomi Mi. The series will include Mi 11 and Mi 11 Pro. A leak suggests that the devices will feature an AMOLED display with a 120Hz refresh rate, a 20MP selfie shot, a UFS 3.1 storage, face unlock, and an in-display fingerprint sensor. The Mi 11 will have a 4,780mAh battery with 30W wireless charging. The phone has a triple-camera system with 108MP primary sensor, 13MP ultra-wide, and a 5MP macro lens.

 

Nubia also confirmed that they will launch a flagship smartphone with the Snapdragon 888 in 2021. Among this, the Red Magic 6 series will be the first gaming mobile phone to feature this processor. Along Nubia, Oppo is releasing its flagship smartphone Find X3 with the same processor. The device is coming in Q1. According to the company, "Find X series will bring an unparalleled new experience to users worldwide". Although OnePlus officially confirmed to release a premium mobile phone in H1 2021. The series will include OnePlus 9 and OnePlus 9 Pro with a slightly different design with and without curved displays. They will likely have an AMOLED display that runs the latest OxygenOS 11 with the fas 65W fast charging. The device will feature a dual 48MP primary camera sensor and an ultra-wide camera sensor on the back.

 


ZTE's Axon 20 5G just did what other Android handsets proved unable

 

At the point when you consider Android brands, you may think greater brands like Samsung, LG, or Huawei, however it appears to be that perhaps we should begin giving more consideration to ZTE. This is on the grounds that the organization has declared that its ZTE Axon 20 5G will be accessible on the 21st of December.

 

Its dispatch additionally implies that ZTE will be the first smartphone maker to dispatch a smartphone that accompanies an under-show forward looking camera. The organization did beforehand flaunt the handset back in September, yet now it would appear that we at long last have a delivery date to anticipate.

 

Right now, the phone will be restricted to a modest bunch of business sectors which incorporates United Kingdom, European Union, Japan, Korea, Thailand, Malaysia, Philippines, United Arab Emirates, Ukraine, Saudi Arabia, and South Africa, however ideally we'll see its accessible extend to different business sectors later on too, in spite of the fact that those of us living stateside ought to most likely not get our expectations up.

 

Regarding specs, the ZTE Axon 20 5G will don a 6.92-inch FHD+ OLED show with a 90Hz invigorate rate. In the engine, the phone will be controlled by Qualcomm's Snapdragon 765G chipset with 8GB of RAM, 128GB of capacity, a quad-camera arrangement on the back, fluid cooling, 30W quick charging, and a 4,220mAh battery.

 

While ZTE will be the first to the market with a smartphone with an under-show camera, they are in good company in seeking after the tech as it is likely the main exquisite answer for disposing of the indent.


poco m3

 

POCO has been focusing on one smartphone for nearly two years, but now the company has tried to add multiple smartphones to its existing and new series in 2020. They have introduced a new smartphone - called POCO M3, which is a direct successor of the relatively recent smartphone POCO M2. Usually, the successor phones take a similar design but the company has completely redesigned the new phone on the rear side and put a new chipset from Snapdragon instead of choosing a chip from MediaTek.

 

The most obvious change in the M3 is the rear design. The brand completely redesigned the back design, making it more of today's design and youth-centric. The design looks expensive as compared to the price tag which is really a refreshing option among its cheaper-looking rivals. The camera is placed in a rectangular shape housing on the top left corner like many other budget series mobile phones, however, the camera unit is placed inside a larger, all-black housing with a big POCO logo on the right side in the vertical fashion. The phone features a large 6.53-inch IPS LCD waterdrop/ dot-drop display as its predecessor with FHD+ resolution and has a gorilla glass protective cover to save the phone in case of accidental fall. The phone also comes certified with TUV Rheinland's low blue light certification.

 

The POCO M3 comes with a large 6,000mAh battery inside that should keep you going for more than a day. This is a significant upgrade from the 5,000mAh battery found on the POCO M2. And what's surprising is that both phones have the same weight despite of the battery difference. The phone still supports only 18W charging, so it should take even longer to fully charge this battery.

 

The previous model had a quad-camera system with the ultra-wide-angle sensor which the company decided to skip this time, leaving you with a triple camera setup instead of a quad-camera setup found on its predecessor. But to compensate for the loss of an important camera sensor, M3 has come with a larger 48MP f/1.79 as a primary camera sensor. There are two other camera sensors, a 2MP macro camera sensor, and a 2Mp depth sensor. On the front side, you get an 8MP f/2.0 selfie shooter. The phone is running MIU12 for Poco, which is based on Android 10. The phone is available with 4GB RAM and 64GB and 128GB internal storage for $129 and $149 respectively.

 

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