I'm trying to unlock an Iphone 4. The celular company allready unlocked it. and send me an E Mail with the instructions to do it myself. I have done every step, and in itunes apears that my Iphone is Unlocked. But I can not use a sim CArd from another Co

Im tying to unlock an Iphone 4.
the celular company make it by its system, and send me an E mail with the instructions to finsh the process by myself, throug itunes.
I did every step, and at the end appers a message telling that my Iphone is unlocked.
but it does not work with other celular company sim card.
It only works with the original sim Card company.
In the Iphone appears a message teeling that has no service with another company's sim CArd.
I don't know what to do.
I've been doing this, with different Sim cards.
sometimes appears a message informing that the SIM card is locked with a PIN. That i must instal the last itunes version and connect it again.
but every Sim card I have are with PIN.
If you can help me I;ll be very glad.
Thank you very Much.
nicanorfrommon

Chrisj4203, thank you for your kind answer.
I have done a lot of restores to the Iphone, and resets also.
I;ve done holding both buttons as you sugested, but there is no signal appearing.
I am in Uruguay, South America and the original company is Movistar ( Telefonica) and the new sim card is from ANTEL ( the officail and biggest company in my country).
I don;t knoe what todo.
I have been trying for more than one mont.
I have gone several times to both companies. Aldo two times to Apple uruguay, and nobody can help me.

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