Why is my phone blocking me from sending one of my contacts a text message

[Jim Baker2]

My phone keeps blocking my text messages to a friend of mine and I would like to know why? Can it be fixed and how? I have an LG optimus fuel 4.4 from net10,I'm not sure what make his phone is, but I do know its an Obama phone

 

[Golfdriver97]

Are you using the one that came with the phone? That may be the bottleneck. You can get different ones on Play. I am currently using Textra.