O2 launches its summer sale on SIM-only plans – but we’ve found a cheaper deal

O2’s summer sale means cheaper SIM-only plans and phones if shoppers are looking to upgrade but it’s not the only offer around

O2 has launched SIM-only and mobile plans as part of its summer sale – but shoppers who are on the lookout for deals, we’ve found it much cheaper elsewhere. The retailer has launched a summer sale on SIM-only deals, meaning shoppers can get 40GB of data on a 24-month plan for £15.99 a month on a 24-month plan.

O2 is also offering 150GB for £19.99 a month for 24 months – meaning users will only need to pay a little extra per month for a lot more data. The summer sale is also extends to accessories, including the Beats wireless earbuds and Apple AirTags.

Another pick, according to the site, is the Samsung Galaxy S25 Ultra for £46 a month and with a £30 upfront cost, although this is on a 36-month contract. But scouring rivals for their prices, O2 isn’t the only retailer worth looking at as we found a much cheaper Samsung deal for shoppers.

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Mobiles.co.uk and its Galaxy S25 Ultra deals. Shoppers will pay almost £1,600 for the O2 deal, where as the Mobiles.co.uk plan allows shoppers to pay £1,180 overall. That’s £420 less.

Plus, unlike O2’s lengthy 36-month contract, shoppers at Mobiles.co.uk will be tied in for a shorter 24-months. The only downside is that they’ll have to pay more upfront to get the phone.

When it comes to SIM-only deals, there are other cheaper alternatives too, but this depends on what shoppers are looking for. Lebara Mobile is offering super cheap SIM-only deals for 12 months.

This includes 50GB for £13.50 over a 12-month contract, meaning buyers will pay less and not be stuck in a contract for as long as O2.

Pay monthly deals, including Sky Mobile’s plans, are often more popular with consumers than paying upfront, as it allows shoppers to split the price into smaller payments. However, despite their smaller monthly cost, but they can work out more expensive.

At the moment, Samsung is giving away a free A9+ tablet with the S25 Ultra so shoppers could sell the device to make a bit more cash – or keep it for themselves.

One shopper said: “I’ve used O2 since Virgin offered the Volt add-on. The deal I got on the phone was good, billing was good, signal was great, the O2 extras are amazing”. However, there are many complaints on its Trustpilot with some very low reviews and it has an overall rating of 1.2.

Mobiles.co.uk has a Trustpilot rating of 4.3 stars with a lot of high reviews for service and connections, however it’s downfall ratings are from a few delivery delays, as users rate on Trustpilot, here.