The only way to do it yourself online would be to actually go in and switch it onto your account and activate the phone. If it works then it's ok.
Clearnet Digital PCS
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^Actually, when you go to "change your phone" and enter the new MEID/ESN/IMEI whatever, before you actually switch your phones, the first page allows you to "validate" to see if the new phone or sim can work and if so, the next page is where you confirm you want to switch your phone or you can just press cancel