Been having same issue with my LG G3 lately. Same sim that came with the phone. Do they ever require upgrades to continue working? I've also gotten a no USIM message. Is this a free exchange from t-mobile or do we need to pay more money for it?

I too have the LG G3 and I started getting the ER05 invalid sim card error. Do we just need a new sim card or do we need to replace the phone? I went to a local T-Mobile store and the people there are only interested in selling me a new phone. They said they sent something to my phone to update the sim. It started working for about 20 minutes and again "invalid sim". Buying a new phone is a last resort as they are not cheap. I called customer service and they sent a signal to my sim. How can you send a signal to my sim, if I don't have any data connection on my phone? I was told someone would be calling me back in 24 hours that was 5 days ago and no return call. Should I continue to wait for a callback or buy a new phone? If I have to buy a new phone, I may switch my service as Tmobile does not seem interested in helping resolve my issue.

okay,so my lg v10 is unlocked and am in a different country from the U.S and my country doesn't have t-mobile as a carrier, so when i carried my phone to my carrier to get a new sim they said that its not working and its displaying the error of this discussion they also said i might have to wait for the t-mobile *something* to be back up to see if they can fix it , i asked how long till its back up they said their not sure, am wondering what i should do

*edit am from/in the Caribbean if that may help narrow down a solution