Had to exchange my G4, some signal problems, etc.. not a big deal, new phone works fine...BUT They would only activate it with the micro SIM that came with the phone, I asked them to please activate it with the nano sim I had so I can swap between the G4 and my Nexus 6, They told me I CAN"T have a nano SIM card because it won't work in the G4, I explained to them I have an adapter, and that I have been using the nano sim card (which they have now deactivated) between phones for the past year and a half, they said it can't be done!!! I left the store aggravated and went home and called customer service.......Same story, "Were sorry you can not use a nano SIM card with the LG G4" AGAIN, I explained the whole story that I've been doing this on several phones for the past 18 months!!!! Then they told me if that is what I want to do I HAVE TO ADD ANOTHER LINE OF SERVICE TO MY ACCOUNT!!! I told her " no Problem, I will be returning the G4 and to take it off my line of service" which she said "we can't do till we receive the phone back". When did AT&T start this crap of only allowing one phone to be used on a sim card?????