$55.29
3G Mobile Phone, Unlocked Smartphone 5.0 Inch IPS HD Screen for Watching Videos (US Plug)Amazon$49.99
Mini Smartphone, Child Phone The World's Smallest Cell Phone 3.0 Inch Unlocked Android Small Phone 2G+16G 5.0MP Dual SIM Mini Phone 3G Mobile Tiny Phone (Black)Amazon$51.72
Sudroid Mini Smartphone, World's Smallest Cell Phone, 2.5 Inch, Quad Core, 1GB 8GB, 5MP Dual SIM, HD Unlocked 3G Mobile Phone with Protective Shell ()AmazonSAVE $4.00
$65.99$69.99
PrzSay Unlocked Smartphone, 6.3 inch HD Display, Android10.0, Dual SIM, Dual Cameras, 1GB RAM+16GB ROM (Expandable to 128GB), Support: WiFi, Bluetooth, GPS 3G Mobile Phones (Golden)Amazon$49.99
Sudroid Mini Smartphone,Child Phone SOYES The World's Smallest Cell Phone 2.5 Inch Android Small Phone Quad Core 2G+16G 5.0MP Dual SIM High Definition Mini Phones Unlocked 3G Mobile Phone (Black)Amazon$3.98
3G Mobile Networks : Architecture, Protocols, and Procedures by Sumit, Narang, Nishit KaseraBetter World Books$74.95
Converging NGN Wireline and Mobile 3G Networks with IMS: Converging NGN and 3G MobileAmazon