Sprint CDMA & 4G
Sprint like Verizon, does not support voice and data at the same time. Sprint follows the same technical standards CDMA, WiMax and in the future, LTE, as Verizon. A visit to a local Sprint store produced similar results as with Verizon. HTC made this statement about the latest phone from Sprint:
If you’re using 4G for data, you can’t use CDMA for voice. Currently the only way to do simultaneous voice and data would be through a third-party VOIP solution. However, this is not due to strict hardware limitations, so it’s possible this could change with future updates.”T-Mobile 3G and 4G
T-Mobile, as we expected follows the technical protocols of AT&T and does support simultaneous voice and data. This can be shown from their website:
As our 4G network continues to expand, our nationwide 3G network offers advanced high-speed coverage. This means you get simultaneous voice and data capabilities for an amazing wireless experience—while on the go.
Short for "fourth generation," 4G is about performance and provides our fastest data speeds, up to three times faster than Verizon's standard 3G networks, while allowing simultaneous voice and data capabilities for the ultimate wireless voice and data experience. (For example, you can make a call at the same time you’re surfing the Web.) T-Mobile offers America's largest 4G network, using HSPA+ technology to offer theoretical peak download speeds of up to 21 Mbps and peak upload speeds of up to 5.7 Mbps. This allows many users to experience a mobile broadband experience comparable to the high-speed connections of a home or work computer.