I think it would be quite expensive for Giffgaff to enable and use WiFi calling, so it's not likely to happen I'm afraid.
I use Viber for voip calls but it's only free to phones that have the Viber app installed. You can call other numbers using Viber-out but its not free.
The biggest negative with all the apps is the fact that no one can phone you on your phone number.
I am sure wifi calling puts more stress on the network as it needs it own servers - but I am sure the people that want it would happily pay a small premium for it as a bolt on - well I would anyway
It’s actually the opposite, it allows the network to route calls away from masts and straight into the network switch for onward transmission, it means the network masts are under less stress.
I’ve been a loyal GG user (of six SIM accounts) since 2013.
Having recently moved to an area of utterly contemptible cell coverage (Whiteley, Fareham, Hants), and where O2 is the best of the bad bunch, I NEED WiFi Calling.
It’s all very well stating obvious-but-unhelpful facts about VoIP clients like WhatsApp, Skype, VoIPCheapCom, Viber, etc, but I need to be able to receive calls on my mobile, and I need to be able to get a hold of family members when they’re at home and I’m not!
O2 have a very Nazi-like attitude towards their BoostBox device — i.e. they don’t allow user config, unlike Vodafone with their SureSignal! — and Cel-Fi is a prohibitively-expensive solution.
So, for me, it’s going to have to be adiós muchachos; it’s been emotional... Soz, peeps.
I just moved my number today to Giffgaff and in fact I will be ordering 3mobile sim to move number again as signal is so bad that most of my calls ending up on voicemail (and I do live in central london). Sorry GG I wanted to like you but it seems you disregard major need of your customers.