Hi ​@Hemin2k 

Thank you for getting in touch with us, I am so sorry that the internet is slow. 

You can check the coverage in your area using the link below:
https://www.idmobile.co.uk/help-and-advice/coverage

You may also find it helpful to try the following steps:

Reinsert your SIM card
Try your SIM in another phone
This will help determine whether the issue is related to your handset or the SIM card.

For iPhone (iOS) – Reset Network Settings:
Go to Settings → General.
Tap Transfer or Reset iPhone → Reset → Reset Network Settings.
Confirm the reset when prompted.
Once complete, return to the home screen and restart your iPhone.

For Samsung – Reset Network Settings:
From the Home screen, swipe up to access Apps → Settings → Connections → Mobile Networks → Network Operators.
Turn Select Automatically on or off.
Alternatively:
Go to Settings → General Management → Reset → Reset Network Settings.
Confirm by tapping Reset Settings.

Thank you, 

Zandile M 

The iD Mobile Team