Is so check with your service provider, someitmes if some informatiion is not given - just as a photo or ID proof- then the service provider can block the SIM until such information is received.
However if this seems alright then you might have to get the unlocking codes from the dealer or service provider from whom the phone was bough for the firrst time.
Sony Ericsson K750 Cellular Phone
phone unlock code phone unlock code for errison k750 as brought phone from.
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