Comment by methou

We had this problem too.

Every time my colleague brought his phone to the control room the Cellular stops working for like a day or two, but my 6s worked just fine anywhere even next to a Dewar that's venting Helium. Now the mystery is solved!

BTW, among us there are others who accidentally brought their phones near or even into the MR bore during maintenance, but none of these devices has done any permanent damage to our phones, except one accelerometer on a cheap Chinese phone, even in a 7T magnet. So I never thought that MRI could be causing the problem.