I gave my gnex to a friend a few months ago when he broke his, so I called him just now to ask about this. He said, he just popped in his sim and that's it. Been working fine on his account ever since.
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Alright, now that I am on a laptop rather than a phone I will do my best to explain better. First lets make the differentiation between CDMA and LTE. LTE is not CDMA, which is what Verizon is traditionally. LTE is much more like GSM, which is why it uses a SIM card. So, lets talk LTE first. Basically each SIM card has an ICCID (the SIM card number), and the phone has an IMEI (International Mobile Equipment Identifier). The IMEI was adopted due to the fact that there was a limit to the number of unique ESN's that can exist. Now then, your IMEI is hard coded to the device, your ICCID is specific to the SIM. The VZW network, billing system, AAA, etc., all use a combination of the two that get hashed into a unique ID. The billing system itself typically relies heavily on the ICCID and will typically automatically re-hash to a new unique ID when adding a new IMEI. So, on a LTE device you can TYPICALLY simply switch the SIM to another LTE device, and it should work fine. There are several conditions that can cause it to not work automatically, including some older LTE devices, manual account locks, etc. Additionally, there are a lot of systems the new unique ID have to be pushed to, so it doesn't always make it. So, don't be totally surprised if it doesn't work out. Simply call tech support and they can help. Probably the most common cause of a failed switch over is the old device being still powered on. Make sure you turn off the old phone before you power up the new one, with the old SIM. Hope this helps!
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