Battery does not hold a full charge.
If you have had your battery for over 2 years and the usage time continues to drop, you should consider replacing the battery. See the Battery Installation Guide.
A suggestion for sustaining battery life is to avoid overcharging the battery. Only charge the battery when necessary (about 10% charge left).
If the battery replacement does not return the battery to a normal level, the motherboard should be checked for any issue if possible. See Motherboard Installation Guide
The settings on the phone have been adjusted and you want to restore the phone to its original state.
The device can be reset manually. When resetting the phone, you will have the option to Reset Settings or Reset All. The first option will change the settings back to default and the second option will delete all data (including downloaded content) and reset the settings.
In order to reset the phone, go to Settings->General->Master Reset. You can choose Reset Settings or Reset All. You will then have to enter the phone lock code, which is by default 0000.
The phone does not power up.
Either the battery needs to be recharged or replaced. See the Battery Replacement Guide to learn how to do this.
The phone is plugged in and does not show this on the screen.
Check to make sure that the proper charger is being used and that the connection with the phone and electrical outlet is snug.
If the device has a drained battery or the battery has not been used for a long period, the charge symbol may take up to 30 minutes to appear on the phone.
The phone menu is in a cryptic foreign code.
If the phone is set to a language you don’t understand, you can set it to the default (determined by the SIM card) by pressing the right directional button, then entering 8888, then pressing the left directional button while the phone is in standby. To always choose English, do the same key combination, but enter 0000 instead.
Your phone is locked and you’re unable to access the menu.
The phone comes with a default lock code of 0000. This can be changed to any 4-8 digit code if desired.
You are unable to connect to your network provider.
If the phone is showing no cellular network available, it means that you are not close enough to a signal from your network provider. Try locating a cellular tower or, if inside, move outdoors to improve reception ability.
You may be in a country or region where there is no cellular provider that can be accessed by your phone. You may be able to buy a new SIM card to solve this problem. See the SIM Card Installation page for more help with this.
You receive an error message that prevents the phone from being used.
If you get this message, it means that your Personal Unblocking Key code (PUK) was incorrectly entered ten times in a row. You must contact your service provider to rectify the issue.
If you get this message while the phone is charging, it means that the battery in the phone is not a Sony Ericsson approved battery.
This message means that there is no SIM card in the phone. You must install a proper SIM card in order to use the device. See the SIM Card Installation Guide for step-by-step instructions.
You may also get a message that says Insert correct SIM card, which means that you are not using a SIM card that is compatible with the phone.
You are trying to access a menu option, but it is gray and not black.
If an option is grayed out in a menu, it means that the function is not currently available.
Source: Sony Ericsson s710a User Guide
