There are four signs that indicate you need to upgrade your phone. First, if your phone has sustained a lot of physical damage, it may be time for an upgrade. Second, if your battery dies quickly and is no longer holding a charge, it's a sign that you need a new phone. Third, if your buttons or screen stop functioning properly, it's a clear indication that your phone needs to be replaced. Lastly, if you have an out-of-date model that doesn't support the latest software updates and features, it's time to upgrade. Remember, when you upgrade your phone, it's also a good idea to upgrade your case to ensure maximum protection for your new device.