T-Mobile offers the Sony Xperia Z1S HSPA+ 4G LTE Android Smartphone for T-Mobile for $528 (Payable in 24 monthly payments of $22.) With free shipping, that's the lowest total price we could find by $62. This 4G quad-band GSM smartphone features a Qualcomm Snapdragon 2.2GHz quad-core processor, 5" 1920x1080 touchscreen, 32GB internal storage, up to 15 hours of talk time, 20.7-megapixel camera, 1080p video recording, Bluetooth, and Android 4.3 OS (Jelly Bean).

Note: To order this phone, you must also buy a SIM Starter Kit, which costs $10.