For many, a Tmobile cell phone may not have ever been something that they've considered buying. Tmobile is, after all, mostly involved in European markets and has never been very heavily entrenched in the United States. Even though it hasn't had a huge presence, it has been here for years. Now, with the recent merger between Tmobile and ATT, it has never been a better time to buy a Tmobile cell phone. This is due primarily to the fact that Tmobile will now run off of the ATT network, which is widely touted as being the largest network in the country.