I had to go through the last 6 pages of comments just to make sure what I am going to say has not already been put out there. My initial thought was that this free international data sounded astounding (not that many T-Mob subs are doing too much international traveling as a value brand, which is beside the point) and then I read the fine print.
Simple Choice International Service: Additional charges apply in excluded destinations; see here for included destinations (subject to change at T-Mobile’s discretion). Qualifying postpaid Simple Choice plan and capable device required. Taxes additional; usage taxed in some countries. Voice and text features for direct communications between 2 people.Communications with premium-rate (e.g., 900, entertainment, high-rate helpline) numbers not included and may incur additional charges. Calls to mobile devices and landlines are $.20/min; texts are $.20 each (no charge for Wi-Fi calls or texts to US). Coverage not available in some areas; we are not responsible for the performance of our roaming partners’ networks. Standard speeds approx. 128 Kbps. No tethering. Not for extended international use; you must reside in the U.S. and primary usage must occur on our U.S. network. Device must register on our U.S. network before international use. Service may be terminated or restricted for excessive roaming or misuse.
Sure, 128kbps will work in most instances (as a few have pointed out here) for those who need basic data access for mapping, emails and other non-data intensive applications. God forbid you forget to tell your friends or family to not call you or text you, because you will be racking up those 20 cent charges pretty damn fast. A fact most are glossing over. Free EDGE internationally is great but there are still some serious limitations when it comes to using your phone as a phone. Hell if you pissed off a former lover who knows that you are in another country via facebook or social media stalking, they might just text you to spite you. Not that the latter case is widespread, but you would still need to either turn off your device (which defeats the purpose of having data available to your phone) in any situation just in case you do start getting texts. I know some serial textaholics, and if every dumb "lol" or similar response is racking up 20 cents, I'm sure anyone (cost conscious value customer on t-mobile) might be a little upset.
As to T-Mobile vs. Sprint Network comparison which seems to be a hot button issue in this thread, yes, t-mobile has been able to seemingly move faster toward deploying LTE than Sprint because of the existing backhaul already being fiber. This does not take into account the sites that are not getting upgrades and are stuck on EDGE 2G.
The bottom line is even with all of those upgrades, their network coverage size still pales in comparison to that of Sprint's Pre/Post NV footprint.
I am not necessarily advocating Sprint over T-Mobile in any regard, people should choose the carrier that provides the best coverage/value in the areas they live/work/frequent; If that is T-Mobile then good on them, if not there are always other options