Can't make phone calls?

[Brooker88]

So I've noticed every now & then I can't receive calls, or make them. There is no dial tone & after a few mins it just cuts off.

I've tried pinpointing the issue & I'm left clueless.

The only solution to fix the issue is to restart my phone.

I've tried turning data on & off. 

Using the sim 2 tray.

Toggling mobile data on/off. 

Turning WiFi calling on/off.

Trying different apn, nothing works.

Mobile data always active.

Literally at a loss. 

This doesn't happen 

[Brooker88]

So I've figured something out.

If I ring a Vodafone number this occurs.

If I ring Giffgaff/O2 number this occurs.

If I ring my daughter's number first (Smarty) it rings, then after I hang up I can call Vodafone & Giffgaff numbers.

I can receive/send texts without issues.

I've also noticed when I'm on a phonecall with my partner or mother (Vodafone/O2) It will randomly hangup.

Haven't tested if this happens when I call a Smarty number

[MSF]

If restarting your phone seems to rectify the issue, this suggests it may be the phone. Have you tried the sim in another handset?

Have you also tried the same calls in a different location? Is it your local signal maybe? Does the handset always show a good number of bars for signal strength?

[Brooker88]

Good morning. I've tried the SIM in another phone & and SIM 2 slot.

In my home where calls are made the most I have full bar, 5G. 

Went on a little 1.2 mile walk & problem still persists 

[GaryHud_1363877]

Same problem here for 6months unthought it was my phone .

Have you found a solution yet.

[Chalkychap]

This type of issue could occur with a damaged or broken SIM card. 
Have you tried using a replacement SMARTY SIM card in your handset @GaryHud_1363877? 
You could try and request a replacement online at http://smarty.co.uk/dashboard/request-new-sim. 

[Dnbkittie]

Hi. Same problem too. I have two Sims in my phone. I've only had smarty maybe 6 months tops and I have randomly the same issue with not being able to make calls. But if I switch to my Vodafone SIM, without restarting my phone, it calls out fine. So it can't be a phone issue per say, but an issue with my phone and the smarty SIM card. Or the sim has an issue?

[MSF]

@Dnbkittie  Well worth requesting a replacement sim so that you can be sure.