See;

https://www.express.co.uk/finance/personalfinance/2066175/huge-change-confirmed-all-three

Hello, l have problem for long time with ID sim, I not receive incoming call and is very bad mobile network , at home I  have only in 2 rooms mobile network but when I go outside then don't have i have to find places where network works.

Hi ​@Laila Lustika 

Thank you for your post, and I’m really sorry to hear you’ve been having ongoing issues with your signal and incoming calls. I understand how frustrating this must be.

To help refresh your connection to the network, please follow the steps below depending on your phone type.

If you’re using an iPhone:

Go to Settings

Tap Phone

Tap My Number

Delete the old number (if showing)

Enter your correct mobile number using the keypad

Tap Save

Then:

Go back to Settings

Tap Messages

Turn iMessage OFF

Go to General

Tap Reset

Tap Reset Network Settings
(This will remove saved WiFi passwords but won’t delete personal data.)

Once the phone restarts:

Go to Settings

Tap Messages

Turn iMessage ON

This should allow the phone to recognise and verify the SIM properly.

If you’re using an Android device:

Open Settings

Tap General Management

Tap Reset

Tap Reset Network Settings

After completing this, please restart your phone.

Once done, please test your signal and incoming calls again.

If the issue continues, please send us your full postcode so we can check coverage in your area with iD Mobile and investigate further for you.

~Marquerita