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You can remove the network lock from Sony Ericsson U5i easily by using an unlock code.You can get this code at low cost from MobileUnlockSolutions.com with easy step by step unlocking instructions and unlock it.After unlocking it,you can use freely any GSM network SIM card.This is the safe,fast and permanent unlocking method.
Some cell phones have trouble reading SIM cards that have been used in other phones. (Example: The Samsung Jack may not be able to read a SIM card that has been used in a previous Samsung BlackJack model.) I run in to this problem almost daily with my customers.
Your HTC phone probably has the same problem. To correct it, you'll need to purchase a new SIM card (you can get one on eBay for the least amount of money) and contact your cellular provider. Tell them you have a defective SIM - that you purchased a new SIM card and you need your account switched to the new SIM card.
After you give them your new SIM card number, it will take about 15 seconds and the new SIM will be ready to use in your HTC TyTN.
Is this phone from the same service provider as your simcard? If not, not all phones are unlocked to work with the sim cards of rival companies. If both the phone and sim card are from the sam company, then you can have the company replace your sim card. They usually do this for free as a courtesy as long as you explain the problem to them. Hope this helps
Since the SIM card is automatically read when inserted, verify it has been correctly inserted. If you have another phone available, try inserting it in that phone. If you can make a phone call, the card should be working. If not, your card may need to be replaced.
first remove the sim card and then switch on the phone... then choose antenna on... after a few seconds you will see emergancy only on your screen ... turn off your mobile and insert the sim and switch it on again ... this solved my problem ... but this is not working on my cell now..
does anybody have a solution?