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My iPhone 3 will not make calls

Always comes up with call failed

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what is the history of your phone? drops/damage/new to you?

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Was my sons. He changed telco companies and bought new iPhone 4. The iphone 3 was networked locked so younger son decided to hit the internet to try and hack it open. I have since spoken to the original telco company and the one which I am with now and the original company has unlocked it from their net work but with a good sim card in it now it just comes up with the message "call failed"

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try opening the "settings"app, go to general, reset network settings.

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Ian Allen will be eternally grateful.
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