Missing Text Messages?

littlebluebox

Registered
I have an iPhone 4s from Verizon and a friend of mine has a Samsung Galaxy II from US Cellular. We frequently send texts and do not receive them, losing them in the network. Sometimes when I call him all he hears is static and all I hear is silence. I'm convinced that this is a network problem, not a software or hardware one. How can I fix this?
 
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