Difficulty texting and and making calls after iOS 8.2 update on iphone 5

Hi

Since upgrading to iOS 8.2 on my iPhone 5 a couple of months ago I have had cellular connectivity problems. But even when I have several bars of reception texts won't send / receive and phone calls fail. iMessage and wifi connection is unaffected. The problems occur 50% of the time. The rest of the time the phone works.

I have checked with my carrier and they say there are no signal problems in my area, I have also replaced the SIM card but problems continue. My carrier says it may be a fault with the phone and to take it to an Apple store. However as I am disabled this is difficult. The phone is also out of warranty.

Has any one else had similar issues and / or have any ideas how to fix it? Should I try a factory reset?