You can go on seasonal hold plan. It's 15 dollars a month. You will continue to pay any tab you still have as per normal. You will have to pick a then current in market plan once you bring it back. If you are going to be gone for a few months, it could be worth it to port out to a VoIP service and port back once you're back. Then you still retain use of the number via data / WiFi use with the VoIP service and it'll cost less than doing the seasonal hold if you will be 2+ months.