Changing your cell phone number might prove to be a headache. There are times when it may be a good idea, though. If you are receiving harassing phone calls, changing the number may be the only escape. If you move to a new area code, getting a new cell phone number with the new code lets people you call in your new town know you're in their area. Or you might just have a particular number in mind that you want for your phone.

Find Out the Specifics

The process and fees associated with changing your phone number differ from provider to provider. Call the customer service number given on your monthly statement to discuss the details. Here are some questions to ask: Can I change my phone number at any time, or must it be during a certain time in the billing cycle? Different cell phone providers may have different requirements about when during the billing cycle you can change your number. Is there a fee associated with changing my cell phone number? Many cell phone companies do charge a one-time fee for changing your number. This fee is often $15 or $20. Does changing my number affect my contract? Changing your cell phone number should not have any affect on your contract with the company. You should retain the same features and still have the same amount of time left on your contract. This is an important point to clarify with the cell phone company before making the change. Can I choose my new number? If you have a certain cell phone number in mind, your cell phone company may be able to secure that number for you if it is available. Do not be surprised, though, if your provider is not able to assign you a specific number. The company may have to give you the next number available for the local area. How long will the change take? Generally speaking, the change happens very quickly, but allow 48 hours to be on the safe side. Can I get voice mail messages forwarded? Many cell phone companies are not able to forward messages from your old number. If that's the case, you need to contact anyone to whom you want to give your new number. Once you know what to expect from your cell phone number change, ask the customer service representative to proceed with updating your account. A cell phone provider will honor the request for a number change only from someone whose name appears on the account.

Source:

T-Mobile: Changing Number FAQ

Bell Canada: Changing Numbers