You can now boost your iPhone 5's Wi-Fi signal by using Absolute Technology's Linkase, which claims that the device can increase your signal for up to 50%. People who complain about their Wi-Fi signal can have this sort-of amplifier for $49.99. This certainly beats having to buy a more expensive router or moving to a better spot to improve your signal.
Linkase promises to improve your phone's "ability to latch onto a signal". It looks like your typical iPhone rim protector but it actually helps you find a reliable signal on top of protecting the sides of your phone. It is also available in various colors on Amazon and as of moment, only the iPhone 5 is supported by the amplifier. However, the company is working on a case designed for the Samsung Galaxy S 4 as well as other more popular devices later on.