Question Verizon customers receive my message but I don't receive their message

[geestarkid]

I have made many efforts for 2 months. I was a Verizon Customer, left for MINT mobile9(tmobile system). I Have contacted Verizon, Mint 30+ times everyone passes the buck. So I can receive MMS from Verizon customers only but not SMS. Everyone and everything else seems to be fine. I went through the Odin and uploaded a new rom but it didnt' solve my issue. Last note I have an old Iphone and I put the MINT sim card in and I can receive SMS from verizon customers although I'm not quite sure if that was just imessage come to think of it. Anyways my next option if I can't fix this is to move to a Verizon network and pay more.