Windows

I I have the Nokia Lumia 920 recently purchased the straight talk sim card kit for it I got online and found all the codes for it I have internet and calling and it was sending messages but when some one would text me back it would go to my old phone. Straight talk told me to reset my so i did and now all i can do is make and receive calls and have the internet and my SMS central number is different now it was +131something now its +417 something some one please help me out