When it comes to determining if you’re ready to upgrade to a new cell phone, you’ll know when is the time. There are signs that indicate it’s time to make the change. Sometimes, it’s society, it’s the media, it’s what you learn by social networking. You don’t know when exactly is the time, but mostly those sub-concious outside influence convince you to make the move and secure the new unit for your upgrade. Generally, it will last as long as you use it and until you are ready for the next upgrade.