I’d only do this as a last resort if nothing else works and the device was truly unusable. I’m not sure this will work, but it might clear out any butterflies from a wonky firmware upgrade, and it will cost less and take less time than having them send you a new device.
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I’m not sure I can be of much help there. I have not done a number transfer to magicJack, and so have not made a video about it. It costs $20 to transfer your number to GV, and I don’t know how and whether Comcast will play nice during such a transfer, so as I said previously, you’ll need to do the research with comcast before making the switch. If you absolutely must keep your existing number, it’s probably better to transfer it to Google Voice and forward your GV calls to magicJack. I don’t like the idea of having to pay a $10 fee every year to magicJack to renew my preferred telephone number, so I didn’t do it that way. I say this because if you were to transfer your number through AT&T and you had UVerse, DSL or Dialup, those services along with any others through AT&T are automatically cancelled during the number transfer. If your number is through comcast, call comcast first to make sure that if you cancel the phone number you aren’t also canceling all of your comcast services at the same time. I suspect you have to choose a phone number or transfer the number from another provider before you can receive the activation code. Kazimierz, I have munged the telephone number you gave in your comment so people won’t see your private phone number.