I have switched to O2 from the dreaded Vodafone (Through Carphone Warehouse) and it seems to be actually good, I like O2 Priority and it was the cheapest deal on Carphone Warehouse. Signal is a lot better then Vodafone as well.
O2 is a trustworthy company with a trustworthy site.
The downside is that O2 has a lot better competitors, I would personally recommend https://giffgaff.com/ as it runs on the O2 network and for Internet and texts is better value for money with a better customer experience.
Well presented ISP/telecom service provider website albeit often slow and unresponsive that's open to all. Some free services such as email and online texting available although the support pages and response is fantastically poor with no likely possibility of making them care or solve problems in less than three years..
not a good customer experience - so confusing. not any direct way to contact specific branches, just one phone number and 'forum' option. the service is good but when it goes wrong it's a pain to contact the customer service team.
I have recently had trouble with a 'home move' through O2. I cannot even list the amount of problems I have encountered due to the uselessness of their customer service and general service teams. I have had around fifty phone calls, and each agent tells me a different thing. talking to them has driven me to tears on a few occasions. after TWO MONTHS with no landline/internet I have ordered a new line through BT, no trouble at all. good riddance O2. never ever ever ever EVER again.
They lied to my husband about how much it would cost to cancel his contract. They said they'd take the payment via Direct Debit, but they didn't, and then they threatened him with legal action. They also claimed to have sent me a SIM card I'd asked for, but they hadn't. And they don't always send me a code to get a Surprise. I'm switching to Vodafone.
Highly trusted site, having ordered goods using this service. Customer service was excellent, friendly & also demonstrated protective measures on card details due to recent change of address which was corrected with a single phone call with next day delivery. No faults at all with this site.