My iPhone 4s on Sprint will not text?

My iPhone 4s with Sprint will not text, but only in my house. My sister has the same phone and has no problems with hers.iMessage works fine, SMS will not work. Once I leave my house, everything works fine. I've gone into Sprint twice to get the problem fixed, and their solutions do not help me at all. I called ##update# to reconnect to the towers and I have reset the network settings, I even restored it to factory settings. Nothing seems to work. Any ideas?

It could possibly be your Wi-Fi connection and/or limited availability of signal.
It honestly really depends. If it only happens in your house, you may either have some material in the foundation blocking the signal or you could be right on the edge of the tower's radius.

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