Ok... so this is my problem... I have a galaxy s3, for which im using the tmobile byop service. I was using it for a while, andit was working just fine save for mms. All of a sudden one day a few months ago, my data stopped working. Ive called straight talk, and done their phone trouble shooting over a dozen times, to no prevail. Ive put my sisters sim in, who uses t mobile, and both her apn, and my straight talk apn works with her tmo sim... but when I put mine in, and use the wap.tracfone apn, the 4g disappears, and I get no access to mobile networks error message when I try to access the web. Ive replaced the sim card, ive changed my number, and ive rooted my phone, still to no prevail. Im seriously about to give up, and I have no idea what the problem is... just to post, my apn settings are... Apn: wap.tracfone Port:8080 Mms port:8080 ... please help?