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Hello and Welcome to FixYa!
Inactive SIM message may arise due to more than one issues. First things first check the hardware of your phone, to do this Put out the SIM card and check what happens. If it shows insert SIM card, its normal. If it shows the same inactive message then hardware malfunctioning.
Ok if the hardware is ok, then its simple. Inactive SIM means that your SIM card is not being able to register your Network carrier. The Phone with a red-line means SIM card registration failed. Although the signal radar works. This may be due to 2 issue; either there is a issue at the Service provider End, to check this call the service providers from other cell or land-line and check the status of your connection against this SIM Card No. If they say everything is ok. Then Its confirmed that your Phone is Network locked (Can only be used for one specific network) In this case coordinate with the seller.
I hope you will have a clearer picture now.
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i bought a new UNLOCKED phone (SE C902) and have tried both a Voda and O2 sim in it, bith produced an "inactive sim" error. I was advised to get a new sim incase mine was just out of date and doing this provided me with the same error...is there anyway to fix this with out sending it back??
Please try these codes. This might work fine for any sim...
*7465625*638*00000000*00000000# NEXT ENTER #7465625*638*00000000# AND THEN *#7465625# to check the locks....all locks are inactive...these are all the locks... 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
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.