I bought a samsung galaxy tab 4 7.0" and connected it to the straight talk network through the B.Y.O.T. (bring your own tablet) kit. It worked great, i could surf the net, play games, and what have you... but the feature i liked best was the fact i could send and recieve texts/MMS, AND make and recieve phone calls, i liked it so much i got rid of my other straight talk phone and just used my tablet! I am just wondering why i can't send/recieve MMS', or make/recieve phone calls anylonger, BUT i can still send regular texts? Please help me out with this?