If you unlock it, yes. If you use it on a different carrier, they'll probably come from LG - or not at all. (The update can't tell whether the phone is SIM-locked or not. But some carriers won't send you an update if you don't have a current account with them, and other carriers can't send you the TMO updates.) Since MetroPCS is part of TMO, you may not even have to unlock it to use them - the MCC is still 310 and the MNC is still 260. (you'd have to change the APN or add a new one, though - the APN, MMSC and APN Type are different. [And TMO is funny with that - Mint uses an APN that works in most markets, but I have to use the TMO APN in Fayetteville, NC. The Mint APN won't work.])