Default Verizon S4 APN? Voice and Data, but no text?

Hello -

Just put my Verizon S4 on T Mobile. I was able to get voice and data working, and can receive text messages but cannot send text messages. Here are my APN settings

MCC: 310
MNC 260
APN Type: default,supl,mms
APN Protocol: IPV4
APN Roaming Protocol: IPV4
Bearer: Unspecified

The rest are not set. Any help?