All Verizon LTE phones are factory unlocked to use with other carriers. I have two Verizon LG G2 phones (model VS980)? one is on active service with VZW, the other is off service that I just bought on eBay. When using a foreign SIM, in this case a Singapore Simtel SIM, my active phone detects the SIM no problem, shows the Simtel phone nbr etc and the local partner network which is T-Mobile. The other phone however, using the same Simtel SIM gives me an error message: "This SIM card is from an unknown source" and I am unable to proceed with setup and can't even get into settings. Both phones are identical except one is on active service. Has anyone figured how to get around this problem? Thanks in advance.