Sky definitely has it too as my sister is with sky mobile and has it. I guess, back to o2 I go.
Visual Voicemail is only available with EE and o2. Wifi calling - see here a good summary of the networks that offer the service for guidance: https://www.4g.co.uk/news/ee-o2-three-and-vodafone-which-networks-offer-wi-fi-calling/
Does plusnet have, visual voicemail, conference all and Wi-fi calling for iPhones please?
Through sites like Quidco or TopCashback - hopefully these links help: https://www.moneysavingexpert.com/shopping/cashback-websites And/Or from: https://www.e2save.com/help/cashback https://www.mobiles.co.uk/cashback
Vodafone retentions contacted me yesterday and offered the following deals which I share here for reference: £9.25 = 5GB + 500 mins + unlimited SMS £16 = 20GB +unlimited sms and calls £22 = 20GB +unlimited sms and calls + entertainment They were offering 1 month worth of credit in the account too