Same here last 3-4 hours, eventually told me there’s a problem with id sims, not network, just told its being resolved but no time mentioned 

Hi ​@Ksameei and ​@leegroves,

We’re sorry to hear that some of you are experiencing issues with your signal and mobile data.

We’re aware that some customers are currently experiencing intermittent connectivity with their iD Mobile services. Our teams are aware of the issue and are working to get services back to normal as soon as possible.

As this is a network-related issue, if you’ve already completed the usual troubleshooting, there’s no need to continue resetting your network settings or making changes to your device.

We apologise for the disruption and appreciate your patience while this is being resolved.

You can keep up to date with the latest information here: https://community.idmobile.co.uk/contacting-id-183/some-customers-are-experiencing-intermittent-connectivity-72269

Regards,

Gemma M
The iD Mobile Social Media Team