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The Cheapest Phones for Pokemon Go
Pokemon Go's system requirements mean it won't work on many basic phones. On Android, you need OS version 4.4 or greater, 2GB of RAM, and a non-Intel processor. The really tricky part is that to use the augmented reality features, your phone needs a gyroscope, and it's sometimes difficult to know if your phone has one. Apple devices need to be an iPhone 5 or greater, for example.
Any phone running Pokemon Go should support LTE, because you need that low 4G latency to catch anything.
The cheapest good phone in America today, the BLU R1 HD$49.99 at Amazon, runs $49.99 if you're an Amazon Prime subscriber, but it's still under $100 without Prime. It can run Pokemon Go just fine, but it lacks a gyro, so you don't get to capture your Pokemon in the "real world" with the camera view. That can be disappointing.
That makes the Moto G4, available on Amazon to Prime subscribers for $149.99, the cheapest phone that can play Pokemon Go well, as it has a gyro. If you aren't a Prime subscriber, you'll have to spend about $200 for your Go phone. A used, unlocked 16GB iPhone 5 at Gazelle.com, meanwhile, runs $209.
If you're a geeky parent, it is apparently possible to hack a fake gyroscope function into the Huawei Honor 5X, which is $119.99 today only for Amazon Prime Day.
Going onto eBay or other used marketplaces can find you some even better deals. The Samsung Galaxy S5, Galaxy S4, LG G3, LG G2, and iPhone 5 all fit the bill here. I see used LG G2 phones for various US carriers under $100 on eBay. If you buy one of these used phones, make sure it works on your carrier's LTE network, because some gray-market imported phones don't.