I did the iHelpBoard .ipcc update but now can't even connect to 3G =_= maybe the 3G base station is down nearby. I stopped getting 3G just now also.

Anyway, I have the LTE toggle but I haven't change my SIM card yet.

Can I still go and change my SIM card now? It is already past their 30th June deadline. And I was waiting for the carrier update until now =_=