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probably because there is a sim lock on the phone preventing u from adding a new sim, if this is the default then u could go to the sim lock area of the phone, & change this by entering the code, if its the first time the default code is either 0000 or 1234, if u bought the phone off someone else u can contact them for the phone, or do a factory reset on the phone & start from scratch, also if the sim is not brand new then it could be protected with a code, or it may not of been activated by the date & has now run out.
You need to Unlock your sony ericsson phone from network lock to use with other GSM Network Sim card...Without Unlocking you can't use with other GSM Network Sim card.Get the unlock code from the site Onlinegsmunlock.com/unlock-your-phone/rs7wp2/ and unlock it easily...............
It may be due to network lock, you can check it with other sim card ,if it remains the same problem ,it may be locked to particular network wont accept any sim card other than the particular network ,you can unlock it and used to other network,try here http://www.theunlockarena.com/sony-ericsson-aino/rs13wp9/
I was sent a Song Ericsson w580i T-mobile from my uncle from Uk and is not accepting my sim card is complaining that I should insert correct sim card, I would really appreciate if i can get a software to enable it work with my sim card.