I have T Mobile cell service as I just moved here from Florida with it. It automatically switched me to Suncom (as my cell phone says suncom on it instead of TMobile)
You are correct about TMobile buying Suncom as we had to get a wireless card for our computer to get internet service in our new home development and they told us at Suncom that TMobile bought them out and you will see more of the name tmobile in September or later. I am waiting to get their new home phone service and eliminate my verizon home service since it will be cheaper to go with TMOBILE home service. Unfortunately right now we are considered out in no man's land and have no choices for cable/internet/home phone.
HTH and if you have any other questions feel free to ask me.
debi