We understand looking to have service at all times. You can activate your SIM on an old device if compatible with the network. As mentioned by Ann154, the device does have to be capable of having LTE calling/Advanced calling. You can view more details by following this link, https://www.verizonwireless.com/support/knowledge-base-218813/. Let us know if you have any questions. We are here for you.
Follow us on TWITTER @VZWSupport
If my response answered your question please click the _Correct Answer_ button under my response. This ensures others can benefit from our conversation. Thanks in advance for your help with this!!