You can keep your number. Purchase the phone and then put your SIM card your using now into the new phone. Your plan, number contacts will be transfered over to the new phone with the SIM card. As far as the refill card, it should work.
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GoPhone is a prepaid pay as you go phone service which was created by Cingular Wireless now known as AT and T Wireless. When the GoPhone service manage your monthly phone bill.

GoPhone is a mobile phone service

GoPhone is a prepaid "pay as you go mobile phone service that was created by Cingular Wireless, now known as AT & T Wireless. With the GoPhone service, you are in control of your monthly cell phone bill . Many times with cell phone service is not paid, you will be surprised when you open your cell phone bill.