Instructions Obtain the unlock code for your K800i if the phone is locked. You can
get the code from an unlocking service, or from the carrier that originally
sold the phone. Turn off the K800i and turn the phone over. Remove the battery cover by sliding it toward the bottom of the phone.
Lift the battery from the bottom and set the battery cover and battery aside. Remove the old SIM card by sliding it out from under the metal clip. If
you have an unlocked K800i, all you need to do is insert the SIM card from your
new carrier. Otherwise, leave the SIM out and reinstall the battery and battery
cover. Turn the phone on and wait for it to boot up. Press left on the navigation pad and press "*" twice, then
press the left arrow again. The phone will display "Personalize with
MNC2." Type the unlock code and wait for the phone to reboot. Turn the phone off and insert the new SIM card.
SOURCE: my Sony ericsson k800i is not ringing in full volume
I had exactly the same problem and came to a conclusion.
When you are playing in your music player at the same time it's playing use the volume keys on the top of the phone.
I hope this helps
SOURCE: k800i sony ericsson not switching on
your phone software program is damage or over DL'
the best way to do is bring to the nearest Cellphone repair shop' and re-program it' special gadget and software is needed...:D
SOURCE: my sony ericsson k800i phone has a problem with signals
hello
the problem is with your phone's hardware
SOURCE: no network coverage sony ericsson k800i
how can get net work coverage in k800i sony ericsison mobeile phone
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