O2 XDA Atmos soft resetRestarting Your Phone
Restart your phone when a programme is not performing properly or the phone is not responding to any keypresses.
To restart the phone
1. Remove the battery.
2. Wait for three seconds, then reinsert the battery and turn on your phone.
WARNING! If the phone is restarted while a programme is running, any unsaved work will be lost.
O2 XDA Atmos hard reset
Resetting your phone will remove all the data from its memory and restore the phone back to the factory default settings.
Note If Encrypt files placed on storage cards is or was enabled before, then backup all files from the storage card BEFORE using Clear Storage or updating the ROM system software. Otherwise you will no longer be able to access the encrypted files on the storage card. Use ActiveSync or Windows Mobile Device Center to transfer files between your storage card and computer. After the procedure, copy your files back to the storage card.
WARNING! Because all your data will be deleted, it is recommended that you back up your data first before resetting your phone.
To reset your phone
1. Click Start > Expert > Clear Storage.
2. Follow the on-screen instructions to reset the phone. The phone will
restart after it has been reset.