Not all of us want to be locked into a long term contract with a wireless carrier. Especially when it comes to data-only devices that might not get used on a regular basis. For those that want to grab a 4G dongle or a mobile hotspot and go, without the need sign their life over, T-Mobile is launching four new pre-paid data options. The 4G passes start at $15 for 300MB over the course of a week, all the way up to 5GB for $50 over the course of a month. The plans are available on the Sonic 4G and plain ol' T-Mobile 4G mobil
