1. How to transfer you number to Giffgaff
You can actually transfer your phone number to Giffgaff! Just open an account and under the tab > My giffgaff > Handy Links > Transfer your number
you will find instructions how to keep your existing number!
Giffgaff runs on the O2 network such that you get reception wherever O2 operates and so far, O2 operates everywhere in the UK!
3. How the minutes are counted
The minutes are counted in terms of seconds! If you use your call for 39 seconds, you only use 39 seconds and no rounding occurs!!! Hence when they say X minutes you literarily get X minutes!
4. Providing referrals
When providing referrals, provide your login ID!
Hope that helps!