I sincerely hope the outcome is positive, however having a phone on your person (even if the battery is detached from the phone) is a simple no-no and would have been ingrained into you since GCSEs.
Unfortunately if they do disqualify you then technically you do deserve it for breaking exam regulations (Sound douchy I know, but rules are rules).
Furthermore invigilators need to err on the absolute side of caution anyway. Also, when you switched it off you could have read notes on your lockscreen as a prompt to help you cheat (Not saying you did, but to the invigilators there is every possibility that you did that).
There shouldn't be any excuse for cheating and all cheaters, in my view should be placed on an "academic crime" list and be barred from gaining any further qualifications and have their previous qualifications rendered null and void. With so many careers and postgrad places (and undergrad if you are doing A Levels) riding on exams, the integrity of these grades have never been more important. How would you feel if someone in the same exam hall as you cheated and thus got better grades and took your rightful place on a course? Personally my head would explode and I would be driven to the brink of suicide if I found that out.
For basic qualifications like GCSEs, I would understand if it was a genuine mistake, however for something as big as a degree at an institution which has the ability offer them, they are accountable for each degree they give out and personally if I was the university I would immediately render that paper as "contaminated" and not be valid, in order to safeguard the integrity of your peers.