Inactive sim!!!! iv got mtn "pay as you go" on my sony ericsson k800i' it works if im in an area for a long time but if i drive around it says inactive sim! wat wid be your best way to sort my problem out? some people say it can be caused by the 3g if so can i disconnect it and whats the easiest way to do it??? thanks

SOURCE: INACTIVE SIM

Sounds like a silly question but did you update the phone via the SE suite or via a flash updater? there may be problems if you left your sim in, if you flashed the phone. If you updated via the SE suite then take a look at the troubleshooting guide and moan to SE. As long as you haven't voided the warrenty on your phone there should be no problem with SE or your service provider repairing your phone for free. :)

Hope this helps. One last thing to try is to out another sim in the phone and see if it works. With any other provider except O2 you will need to use a sim the same as yours.

SOURCE: inactive sim

I have the same problem since I got O2 to block my phone when i lost it. Now it's found it says "Inactive SIM", even though the SIM works in other phones.

SOURCE: se k800i dead

Try updating it with Sony Ericsson Update service on the sony Ericsson site using your data cable. I did it with a clients phone...

SOURCE: k800i phone

Charge it over night, Replace the battery or update the firmware useing a sony ericsson update.

SOURCE: Sony Ericsson W850i Insert sim error

you can take the phone and ahve it unlock