I have been happy with my service until recently, i have been getting poor quality sound and my phone disconnects after a short time
Go to Solution.
First thing to try is replacing the sim card
Easiest way is an O2 store
Also check this
Guide: How can I sort out my network issues?
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This may not apply to you but I believe iPhone 12 and 13 models had some issues with disconnections and I experienced this. It seemed to happen when moving from one mast to another. The latest iOS update was documented to address this.