I was horrified to discover I can’t have group calls on giff gaff, I thought group calls were sooo last year and can’t understand why it’s still not possible on giffgaff. This makes it extremely hard for business calls with my work and is causing me to reconsider which network provider I use. Luckily I have a Vodafone sim also which I have to dual sim with but obviously not cheap or convenient in the slightest. What is all that about.
Completely understand that you want to use merging calls on giffgaff. giffgaff is run by us, so there is a place called the Labs. The idea of merging calls is there also- https://labs.giffgaff.com/idea/7557 and it has 429 votes. If you hit the red heart will add your vote too.
Although It may get implemented but if it does it will take time to develop i guess.