I have at and t and when i send a text to my friend who has Verizon it wont go through even tho i can sen them to other Verizon phones just fine and he can receive other texts whats wrong?

If this happens repeatedly, the one friend with the Verizon Wireless phone that is having problems receiving needs to check their account to make sure it is provisioned correctly and update their phone by dialing *228 SEND option 2. If still having trouble, this friend needs to have their phone looked at.