Calls keep dropping

[deedee3]

Good afternoon. I have 2 o2 lines. 1 works fine but the other suffers from terrible reception and calls keep dropping. I have had the phone checked out and there are no issues with the phone. If I call the other line when I am out, the line is firstly silent and then kicks in about 5 seconds later. Has ano one esle suffered similar issues? Thanks. 

[MI5]

@deedee3 

I'd start with a new sim.

Pop in store with photo ID to get one for free.

Guide: How can I sort out my network issues? 

[deedee3]

Thanks, will pop in to store and try this.