Hi there ​@Ramisha 

This might be related to your area having had the 3G turned off. You could check your phone is set up correctly

Obviously you couldn’t have called them so was this via live chat or email or via iD Mobile’s social channels?

If it wasn’t iD Moible who did you contact?

Hi ​@Ramisha 
 

What phone do you have?

Have you checked the coverage for your area?
https://www.idmobile.co.uk/help-and-advice/coverage

Has the 3G signal been turned off in your area recently?

Is your handset on the approved list?
https://www.idmobile.co.uk/help-and-advice/approved-handsets

Do you VoLTE enabled on your phone? You need to connect to LTE (AKA VoLTE - Voice over LTE) to make/receive calls. 4G is only a label given to the 4th Generation network but LTE is the type of connection used. 

You could also try requesting a replacement SIM as this could be the problem.
Please be aware that your account will be put on hold (you will be unable to use that number) until the new SIM has been activated.

There are a few different ways to get a replacement SIM. Here’s everything you need to know:
 

If your SIM card doesn't fit your phone, or it's been lost or stolen, you’ll need a replacement. To get a replacement SIM card, you can:

• Visit any Currys store.

Find your nearest store and head to the ‘Mobile’ section. One of our helpful Tech Experts will issue you a replacement SIM card.

• Chat to us.

Our Live Chat team are able to issue you a replacement SIM card, which will be sent in the post to the account holder’s address.
 

Once you receive your replacement SIM card, you’ll need to activate it. Check out the steps in the article below:

• How do I activate my new SIM or eSIM?F.A.Q.

Let us know how you get on x

Hey there ​@Ramisha, sorry to hear that.

What phone do you have, and what’s your full postcode please?

Thanks,

Tyler