So I recently got a replacement LG G8 shipped to me after my previous one stopped working. I removed the SIM card from my previous LG G8 and put it into my replacement LG G8. Ever since, I found that my mobile data does not work at least 80 - 90% of the time, as well as not being able to send or receive texts or calls unless I'm on WiFi. Any help or suggestions would be much appreciated. Thanks in advance.