Mobile Data doesn't work

[AC Question]

On my LG G3, I have Mobile Data switched on but nothing comes up in the info bar at the top of the screen, just bars of signal, and no H,H+,3G,4G. This is the first time I've had this problem since I got the phone in August last year. My Wi-fi works fine, and I noticed this problem about 5-6 hours ago. I have restarted the phone twice, and taken the sim out and put it back in, and it hasn't worked.

 

[B. Diddy]

Welcome to Android Central! Which carrier? You might need a replacement SIM card.