Chattr SIM Only review
Updated September 30, 2026 · TariffCue Editorial Team · Facts checked September 30, 2026
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Our verdict
Chattr SIM Only suits people in GB who want a rolling SIM that can leave any month and will not raise the bill. Roaming is already included.
Key facts
- Best for
- A cheap rolling SIM in the UK with included roaming and no locked-in term.
- Seller type
- Mvno (Source, checked September 30, 2026)
- Host network
- O2 (Source, checked September 30, 2026)
- SIM-only
- Yes (Source, checked September 30, 2026)
- Price from
- £5 (Source, checked September 30, 2026)
- 5G
- Yes (Source, checked September 30, 2026)
- EU roaming
- Included (Source, checked September 30, 2026)
- Roaming countries
- 43 (Source, checked September 30, 2026)
- Mid-contract price rises
- No price hikes (Source, checked September 30, 2026)
- Credit check required
- No (Source, checked September 30, 2026)
- Network coverage
- 99% (Source, checked September 30, 2026)
- Markets
- GB (Source, checked September 30, 2026)
- Legal entity
- Kashcow Ltd (Source, checked September 30, 2026)
- Headquarters
- United Kingdom (Source, checked September 30, 2026)
- Support channels
- Email (Source, checked September 30, 2026)
- Billing
- Rolling
- Contract length
- 1
- Official website
- chattr.co.uk
Apps and profiles
- Elsewhere
- instagram.comfacebook.com
Pros and cons
Pros
- £5 is the entry price on the SIM only plan, and No price hikes means the renewal bill does not climb
- included roaming across 43 countries comes as standard rather than as an add-on
- Rolling billing on a term of 1-month means the line can end without an exit charge
- No credit check, which suits anyone with a thin file or no UK credit history
- 5G runs over the O2 network with 99% coverage
Cons
- Support runs on email only, so a question with no quick email answer waits for a reply
- Service covers GB alone, so the SIM does not work for a trip outside the UK unless roaming applies
- Chattr SIM Only is an mvno on the O2 network, so coverage follows the host rather than a network of its own
- The entry price of £5 covers a small allowance, so heavy data users pay more for a bigger plan
Who it suits
- Anyone in GB already holding a handset and happy to bring their own SIM
- Travellers who want included across 43 countries without a roaming add-on
- People who need a credit check free line and prefer rolling billing over a locked contract
Who should look elsewhere
- GETESA, Lonestar Cell MTN and yesss! sell as networks rather than an mvno, so buyers wanting the host's own support and shop presence should look there first
- Phone buyers wanting a handset bundled with the line, as this offer is SIM only
- People wanting phone or chat support, since help runs on email alone
What it does well
Chattr SIM Only sells one thing well: a cheap line on the O2 network with nothing extra bolted on. The offer is SIM only, so the handset is yours and the bill covers the line. Coverage is stated at 99%, and 5G is available on the same network. Roaming is included across 43 countries, which is the part that separates this from plenty of rivals where EU travel is a paid extra. There is no credit check, so a thin credit file or a first UK line does not rule you out. The line runs on a rolling basis with a term of 1 month, so it can be cancelled without paying to escape a contract. The catch is scale: the cheapest tiers carry modest allowances, and the extras other brands push, such as bundles or in-store help, are not the reason to pick this one.
Who runs it
Chattr SIM Only is a mobile virtual network operator, so it buys capacity from O2 rather than owning a radio network of its own. The company behind it is Kashcow Ltd, registered in the United Kingdom, and it is a small operation rather than one of the big four. Running as an mvno means the network, the coverage map and the signal you get come from O2, which is useful to know if you are moving house or spending time in areas where another host performs better. The practical downside of a small provider is support: help runs on email, so a problem that needs a phone call or a person on chat has to be written out and waits for a reply. Everything else, billing, the SIM, and the price itself, is handled digitally. For anyone comfortable with written support and a low monthly cost, the setup suits that preference well.
How Chattr SIM Only compares
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- 8.9 vs 8.0
Where Chattr SIM Only is available
- Available
- United Kingdom
Countries from the brand (Source, checked September 30, 2026)
Frequently asked questions
What does the cheapest Chattr SIM Only plan cost?+
The SIM only line starts at £5. That is the entry price for the plan rather than a promotional first bill, and No price hikes applies, so the same figure carries over to renewal. Larger data allowances are available on the same rolling billing.
Does the price go up when I renew?+
No. The stated position is No price hikes, so the monthly figure a customer starts on is the figure carried forward. Renewal pricing is therefore predictable, which is unusual among rolling SIM only deals where providers often adjust charges over time.
Am I tied to a contract?+
Billing is rolling, and the plan term runs for 1 month. There is no long contract to serve out, so the line can be cancelled from month to month. The trade-off is that a rolling line gives up the discounts that come with committing to a fixed term.
Do I need a credit check to sign up?+
No credit check is required. The provider is set up for people who have no UK credit history, or a thin file, and the application does not hinge on a credit score. That also means approval is not a question of passing a financial test.
Does roaming cost extra when I travel?+
Roaming is included across 43 countries, so there is no roaming add-on to buy before a trip. The line is sold in the United Kingdom, so travel outside that market relies on the roaming terms rather than domestic pricing.
Which network does Chattr SIM Only run on?+
The SIM sits on the O2 network, with coverage stated at 99%. Chattr SIM Only is an mvno, so it buys capacity from that host rather than running its own radio network. Coverage in a given street therefore matches O2, not a provider-specific footprint.
How do I get help if something goes wrong?+
Support runs on email, so questions go out in writing and wait for a reply. The provider is Kashcow Ltd, based in the United Kingdom. Anyone who needs to speak to someone on the phone should weigh that before signing up.
Can I use this SIM in a phone I already own?+
Yes, because the offer is SIM only. No handset is included, and the plan assumes the customer brings a compatible unlocked phone. That keeps the cost down to the line itself, at £5 for the cheapest option, and works well with an existing device.
Sources
- chattr.co.uk checked September 30, 2026
Backs: Credit check required, Host network, Headquarters, Markets, Price from, SIM-only
“No Credit Checks, Everyone Accepted”
- chattr.co.uk/contact-us checked September 30, 2026
Backs: Legal entity, Support channels
“Kashcow Ltd (trading as Chattr)”
- chattr.co.uk/plans checked September 30, 2026
Backs: Billing, Network coverage, EU roaming, 5G, Contract length, Mid-contract price rises, Roaming countries, Seller type
“No Long-Term Contracts, Cancel When You Want”
Compiled from 3 source pages, checked September 30, 2026. We did not open an account.
Not confirmed yet: Reference plan prices, Unlimited plan price.
Chattr SIM Only
A cheap rolling SIM in the UK with included roaming and no locked-in term.