Hi I have a sony erricson u10i I inserted my vodacom sim and it says inactive sim what do I do to fix it?????

its not active

Ask in a Sony Ericsson centre or to your network provider.Mostly you will have to unlock your mobile with the SIM that displayed this message. You can get the unlock codes from www.unlocking4u.com.

i am mobile engineer . now this time my hand sony ericsson c905 insert sim solution very need please help me

google a programme called 'aerix'

Could be two reasons: Your phone is already blacklisted (if bought secondhand the owner reported lost/stolen) or the phone is locked to certain network. And might be your SIM was deactivated (try it in different device if works).

Hi Friend,
Kindly note down the below steps,

Unlock Method for SAMSUNG PROPEL A767. No Cables or Software Needed.

1. Turn mobile phone on with unaccepted sim BUT NOT FULLY INSERTED (only push it half way into sim slot).

2. Insert unaccepted sim to phone (push the sim fully into the sim slot).

3. Input *2767*3855# and phone will reboot and will be temporarily unlocked.

4. Input *7465625*638*00000000*00000000#

5. Input #7465625*638*00000000#

6. Input *#7465625# to check the locks....all locks should now be inactive as or similar to below:

network lock - inactive
subset lock - inactive
sp lock - inactive
cp lock - inactive
sim lock - inactive
activa lock - inactive
phone lock - inactive
auto network - inactive
auto subset lock - inactive
auto sp lock - inactive
auto cp lock - inactive
auto sim lock - inactive

Check and revert back

Regards,
Ayyasam

this erroe happens because the phone may be locked 
r else the gsm may not be supporting 
indian gsm and us gsm varies a lot check the gsm

hi Naidoo.
not sure if this forum will help you out but have a look.
K800i inactive sim
plus found this on the internet.

it may be the software needs reloading, if you download the "sony ericsson pc companion" to your pc you can connect your 800i by usb lead, then click on the companion panel for updates, it will give you the option to repair phone, select this option and all your software will be renewed. or if you prefer to contact orange first just go onto their website and the phone numbers will be there.
(AND THIS)

U just istall p.c. suit of sonyerricsson and take backup of ur data,, then u need to flash ur handset from sony erricson service centre.

OR THIS MIGHT HELP.
sony ericsson k800i inactive sim problem Google Search

the phone needs to be diagnosed so take the phone to a mobile service center and have them correct it.

u shuv it up ur ***!! thats wat i done it now works :D