Chattr is a digital first MVNO focused on simple plans and online only management. Everything from sign up to plan changes is handled through its app or website.
Chattr targets users who are comfortable managing their mobile entirely online and don't need or want a high street or call centre support option. Plans are flexible and straightforward. As a newer entrant it is worth comparing on price against more established MVNOs on the same host network.
Chattr operates on a UK host network check its website for the current underlying network, as this can change for newer MVNOs and affects the coverage experience.
Chattr's entire journey from sign up to billing to plan changes is designed to be completed online. If you prefer app based self service over phone or shop support, this is a selling point. If you sometimes need to speak to someone, factor in the support model before switching.
Chattr describes itself as a network running on O2's infrastructure, which would normally make it an MVNO. But one detail doesn't quite fit that picture: some Chattr plans include access to O2 Priority, the rewards programme O2 reserves for its own direct customers. Genuine MVNOs running on O2, like giffgaff, Sky Mobile or Tesco Mobile don't pass Priority through to their customers, because they're not O2 customers in the strict sense. The fact that Chattr does suggests it may be selling O2 plans directly under the Chattr brand as an authorised reseller, rather than operating as a true MVNO. The practical difference for customers is small coverage, performance, and customer service experience are similar either way but it's worth knowing the distinction, particularly if you're comparing Chattr against the established O2 MVNOs.