Hello, With my recent acquisition of a 5s, I'm giving my girlfriend my iPhone 5. She was due for an upgrade from Verizon but didn't want to give up her unlimited data on the 4 so she's going to use my 5. I went through the "switch device" process on her VZW account - when it asked for a SIM number I put in the number of the SIM card that was in the iP5 - which had been "my" SIM up until I activated the 5s. Now she seems to have LTE and data works on the phone, but phone calls and texts (non iMessage) still fail. Was having her use my SIM a mistake and do we need to get that replaced? Thanks for any info!