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Or you could have a script that, when notices the user agent to not be mobile, shows the IMEI version, but otherwise shows the reset version :P

Except there is no javascript on that page. They could do the same thing server side though

There is no reason to assume that "script" means javascript or client-side script.

(Perhaps the comment was edited after you suggested the correction)

no script required...apache has a setenvif module that can do a special action based on browser, refer, ....