3G on my iPhone 4 suddenly stopped working for my and my mom. Help?

My Mom and I have had  iPhone 4s for almost a year. They are up to date. Yesterday and Today, however, the 3G no longer works. It has always worked up to this point. Does anybody have any ideas as to why or how to fix this? Thanks
Other Info:
-My Dad's iPhone is fine
-They are not Jailbroken
-The 3G worked up until yesterday
-We have not left the area for a while
-Other people we know with iPhones are not having any issues
Thanks

try a reset you won't lose any data. hold down the home/power button together until you see the apple logo and then release.  wait for the phone to boot back up. see if that helps.

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