Why does it say sim unknown source?

[savvybro]

I got a galaxy s5 from a friend. it's verizon and I activated it with straighttalk and every since I turned it on its telling me I have an unknown source and also I just have an H above my service bars. can somebody please help me.

 

[Golfdriver97]

Welcome to the forums. Was the device unlocked to use on other carriers?

 

[savvybro]

I'm pretty sure it was.