Many people are confused about taking mobile phones to Pakistan so let's clarify a few things:
If your stay in Pakistan will be under 60 days, you do NOT have to do anything. Just take your phone with you - no checking at the airport and no need to register anything anywhere.
If you are staying more than 60 days, you will need to register your phone either online or via text message. If you do not register your phone, it will stop working after the 60 day period. Please note that your phone will still work in UK. The block is only in Pakistan.
You don't have to wait in any queues at the airport (as was the case in the early days). You have 60 days to register your phone by visiting a website and entering your details. You can also register via text message instead of through the internet. You need your passport number and the phone's IMEI number in order to register a phone. One person can only register one phone.
You are only allowed to bring one phone. For additional phones, you need to pay a custom fee that varies depending on the handset. However, there are no checks at the airport to ensure that you only have one phone.
Here is the link for the Device Registration Portal: https://dirbs.pta.gov.pk/drs.
