How to set up an existing phone number on an old iPhone 4S?

My mom had the iPhone 4S until she got the 5, and she restored it to factory settings and kept in in the original box. I had an iPhone 4, and lost it outside in a field, while I had my camouflage case on it… She gave me her old 4S and I selected the option to "restore from iCloud backup" and I entered my Apple ID and everything worked, I got all my pictures back and my messages and apps, except for one thing- there's no service, and the phone says that its number is my mom's phone number, and not my original phone number. How do I get this phone to have my phone number and have service and work?

Call the carrier and tell them you want to put your number onto that phone.

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