Which iPhone model do I have?
Many models look very similar to each other, however you can find out your iPhone’s model and storage capacity by entering the serial number of your phone here.
You can find your phone’s serial number by tapping the settings icon, selecting general followed by about.
When should I think about replacing my battery?
An iPhone should be able to last at least a full day on a complete charge, although your battery life will vary depending on your data, Wi-Fi and Bluetooth usage. The phone’s battery will start to hold less charge after approximately 1 ½ years of daily usage, after which you may benefit from replacing the battery.