Which? on Instagram: "Angry O2 customer? 😡 You don’t have to accept the new price hike! You can exit your contract fee-free and get yourself a better deal - but you’ll need to act ASAP as O2 is only giving its customers 30 days to switch away without penalty. Comment 'SWITCH' and we'll send you a link to a round-up of the best deals we've seen that could save you money. And if you're worried switching will a lot of waiting, and bouncing from customer service agent to customer service agent. Don