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Login to your active MyOTC account (students will use their student account, employees of OTC will use their staff account) and click the Helpful Resources icon.
In that submenu you will find the link to OTC Emergency Notification:
Type in your 10 digit phone number (no spaces or dashes necessary, it will auto-insert them) and then select your carrier.
Your mobile device should then get a text message asking you to validate, with instructions on how to do so.
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