Great question. What a nice gift for your granddaughter. If she is on Verizon Wireless you can just send her the phone and her family will be able to activate it on their account. Our phones are designed to only work on Verizon Wireless.
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Thats apparently not true out here in Sprint land because I gave my phone to my daughter-in-law and was told that they could not activate it
CDMA work differently than GSM.
GSM doesn't require the phones identity to work, and validate itself to the network.
CDMA requires the device to identify itself and also the carrier database needs a copy of the phones Identity in it's database to let it connect. Since it doesn't have the IMEI the phone can never connect.
Verizon and Sprint are slowly moving away from CDMA over to GSM, but it isn't far along enough as of yet.