IPhone 4 - cannot call or text

My iPhone 4 suddenly stopped being able to make calls or send texts. I was able to perform these functions no less than 30 minutes ago in a location close to my apartment, but now that I'm home, these functions don't seem to be working anymore.
I've tried rebooting the phone several times, switching the WiFi network on and off, and also tried all of Apple's suggestions in the Troubleshooting section regarding this issue -- but nothing seems to work!
Does anyone have any suggestions?  Any help would really be appreciated!

Calls and texts (not imessage) are a carrier function.  Do you have a good signal from your carrier in your house ?

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