I’ve recently changed my mobile to a dual sim android phone.
This way, I’ll have both my work number and my personal number active on the same phone.
But at one point, I was working at a customers premises, and I noticed the phone kept showing error notifications along the top:
Restricted Access changed.
I also noticed that I couldn’t make any calls, even though I would get a signal strength of 1 or 2 bars.
Eventually, when I finished and got in my car to head back to the office, I got a stronger signal, and the error messages just disappeared.
I still get the error on some occasions, but now I know that its just the phones way of saying: I can’t get a good signal.