What is a security code? - Support - Vodafone IE
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What is a security code?

The security code, or OTAC (Over The Air Code), is a text message we send you to check that you have the phone you are registering. It is one of the things we do to to stop anyone else registering your phone.

Remember: this code will expire within 15 minutes of being sent to your phone. If it expires you can send yourself another security code.

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