I don’t have a computer so how do I do this

See if you get with a friend or relative, who do have a computer, to help you with this. Alternatively, pay a visit to your local Apple Store or Apple Authorized Service Provider to get this resolved.

Barbarap Said:

"I don’t have a computer so how do I do this"

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Whom to Contact:

Contact your Carrier, as they are the one who provide you with the service of Cellular.