The second-largest GSM carrier, T-Mobile, grew out of the former VoiceStream Wireless in 2001 when VoiceStream was acquired by Germany's Deutsche Telekom. T-Mobile operates one of the smaller U.S. networks of the big four carriers, but it has roaming agreements with AT&T and other smaller operators. Though different from AT&T's, T-Mobile's phone lineup is still quite varied and includes a number of smart phones.
Things you should know:
Fast facts:
| AT&T | T-Mobile | Sprint Nextel | Verizon Wireless | |
| Coverage map | AT&T coverage map | T-Mobile coverage map | Sprint Nextel coverage map | Verizon Wireless coverage map |
| Technology | GSM; GPRS; EDGE | GSM; GPRS: EDGE | CDMA; 1xRTT; iDEN | CDMA; 1xRTT |
| 3G network | Yes, UMTS, EV-DO | No (coming in 2007) | Yes, EV-DO | Yes, EV-DO |
| Data plans | Yes | Yes | Yes | Yes |
| Streaming video network | Yes, AT&T Video | No | Yes, Sprint Power Vision | Yes, Verizon V Cast |
| Music download service | Yes, AT&T Music | No | Yes, Sprint Music Store | Yes, V Cast Wireless Music |
| Push-to-Talk | Available, depending on phone model | No | Available, depending on phone model | Available, depending on phone model |
| Analog roaming | No | No | Yes | Yes |
| Prepay plans | Yes | Yes | No | Yes |
| Family plans | Yes | Yes | Yes | Yes |
| U.S. Cellular | Alltel | MetroPCS | |
| Coverage map | U.S. Cellular coverage map | Alltel coverage map | MetroPCS coverage map |
| Technology | CDMA; 1xRTT | CDMA; 1xRTT | CDMA; 1xRTT |
| 3G network | No | Yes, EV-DO | No |
| Data plans | Yes | Yes | No |
| Streaming video network | No | Yes | No |
| Music download service | No | No | No |
| Push-to-Talk | Available, depending on phone model | Available, depending on phone model | No |
| Analog roaming | Yes | Yes | Yes |
| Prepay plans | Yes | Yes | No |
| Family plans | Yes | Yes | No |