Knowledge Base

How can I transfer my mobile number to giffgaff?

Started ‎20-03-2012 by
Modified ‎01-07-2019 by

Now your SIM card is activated, you may want to transfer your existing phone number (from another network) to your giffgaff phone.

If you just want to transfer your existing giffgaff number to a new giffgaff SIM, please have a look at this article about SIM Swap instead.

Transferring your number only takes 3 easy steps:

  1. Get your PAC code from the previous mobile operator
  2. Prepare for the transfer (e.g. backup the numbers from the old SIM)
  3. Go to the transfer page and request a transfer

Important Note: You can perform this action only if you have a number from another UK network.

More Information

Transferring your phone number from a mobile provider to another requires a Porting Authorisation Code (PAC). You must ask your previous mobile operator for the code and then give it to giffgaff.

To get the PAC code text 'PAC' to 65075 from the number you want to transfer. The SMS is free of charge.

Transferring your number will deactivate your old SIM so you need to transfer any data you might want to keep from your old SIM card to your phone memory.

Ensure you have made a note of any important numbers on your old SIM/mobile, or any data from your message folders, as well as calendar reminders. These will not be transferred with your mobile number and may be lost.

Your existing airtime credit and/or goodybag on your giffgaff account will be available after your number has transferred in, although it will be removed from your account during the transfer.

Any remaining credit, package allowances and rewards with your previous service provider will be lost when your number is transferred to giffgaff. It is not possible to have this credit transferred to your giffgaff account.

Once you have received your PAC:

  • Go to the transfer form
  • Fill the form, including the number you wish to transfer to giffgaff, the PAC and the date you wish the transfer to take place on. NB this date must be within the next 14 days. 
  • Once you're done, submit the form by clicking on "Transfer your number"

That's it, you just have to wait for the transfer to go through.

If you request to transfer your number before 5 pm, your number may be transferred on the next day. Requests made on Friday are processed on Monday. Requests made on Saturday and Sunday are processed on Tuesday.

Point to note: The Mobile Network Portability system does not operate on Bank Holidays so you cannot port in to any UK network on those days. 

On the day of the transfer, you will experience a loss of service on your old SIM at some stage between approximately 9am and 9pm. As the process is dependent on your previous mobile operator releasing your number, we cannot offer assurances about the length of time you will be without service.

We made the graph below to give you an idea of when we release (violet) and assign (green) giffgaff numbers over the course of a regular day.


When you lose service on your old SIM, you will see an error message similar to 'SIM card registration failed.' At this point, put your new giffgaff SIM into your mobile.

Your giffgaff SIM will then stop working for a short while and then start working again but you may find that calls, texts and data work at different times until the process is complete.

It is advisable to switch your phone (with the giffgaff SIM in it) off and on every half hour or so until everything works correctly, which will signify that the number transfer has completed.

If you already tried to switch your phone off and on, you can try this tip recommended by our members:

  1. From your phone keypad dial *100*7# and press call
  2. Then dial  *100# and press call
  3. Repeat the first two steps several times

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