Updated September 30, 2026 · TariffCue Editorial Team
O2 CZ Datamanie vs SMARTY
O2 CZ Datamanie vs SMARTY: the differences
| Compare |  O2 CZ Datamanie |  SMARTY |
|---|---|---|
| Seller type | Network | Mvno |
| Price from | CZK 199 | £5 |
| Reference plan prices | Datamanie 1200GB: 249 CZK per month, 1200 GB per year, annual prepay; Datamanie NEO: 499 CZK per month, unlimited, 30-day; Datamanie 2GB: 199 CZK per month, 2 GB, 30-day | 40GB: GBP 10 per month, 40GB, 1-month rolling | Unlimited: GBP 20 per month, unlimited, 1-month rolling | 2GB Data Only: GBP 5 per month, 2GB, 1-month rolling |
| Unlimited plan price | CZK 499 | £20 |
| Markets | CZ | GB |
| Host network | Not confirmed | Three |
| Wi-Fi calling | Not confirmed | Yes |
| Hotspot sharing | Not confirmed | Yes |
| Mid-contract price rises | Not confirmed | No annual price rises on rolling one-month plans |
| Multi-line discount | Not confirmed | Yes |
Same on both: SIM-only (Yes), 5G (Yes), eSIM (Yes), EU roaming (Fair use), Credit check required (No).
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Key differences
- SMARTY scores higher overall: 9.0 vs 8.9.
- Support channels: only O2 CZ Datamanie offers Chat, Phone.
- Support channels: only SMARTY offers Help centre, Community.
- Billing: only O2 CZ Datamanie offers Prepaid.
- Billing: only SMARTY offers Rolling.
- Markets: only O2 CZ Datamanie offers CZ.
- Markets: only SMARTY offers GB.
Our verdict on each
O2 CZ Datamanie
O2 CZ Datamanie suits Czech readers who want a prepaid sim only line with eSIM, 5G and no credit check, and who will stay on their home network rather than travel. Entry sits at CZK 199 and the unlimited plan at CZK 499, a solid pair for a single market.
SMARTY
SMARTY suits anyone after a rolling monthly SIM, a low entry price and the usual extras with no credit check, and it stays cheap at renewal because annual price rises do not apply to its rolling plans. Its unlimited plan ranks 89 of 173 on price, where heavy users get their value.
Score breakdown
| Area | O2 CZ Datamanie | SMARTY |
|---|---|---|
| Cost | 9.0Prepaid billing, plans from CZK 199, unlimited data at CZK 499, ranked 146 of 258. | 9.1HigherEntry plan from £5 a month, unlimited at £20, rolling billing with no annual rises. |
| Offer | 8.8Sim only, eSIM and 5G, no credit check, roaming on fair use terms in CZ. | 8.9HigherSim only on Three with eSIM, wifi calling, hotspot sharing, a multi line discount and no credit check. |
Licences and countries
| Country | O2 CZ Datamanie | SMARTY |
|---|---|---|
| Headquarters | Czechia | United Kingdom |
Additional countries for O2 CZ Datamanie: 1. Additional countries for SMARTY: 1.
What we checked
O2 CZ Datamanie
- o2.cz: 15 facts, checked September 30, 2026
SMARTY
- smarty.co.uk: 20 facts, checked September 30, 2026
How they place
| Ranking | O2 CZ Datamanie | SMARTY |
|---|---|---|
| SIM-only deals | 217 of 416 | 184 of 416 |
| Phone plans with eSIM | 211 of 389 | 186 of 389 |
| Phone plans without a credit check | 17 of 26 | 11 of 26 |
Every fact side by side
| Fact | O2 CZ Datamanie | SMARTY |
|---|---|---|
| Billing | Prepaid | Rolling |
| Contract length | 1 | 1 |
| Legal entity | O2 Czech Republic a.s. | Hutchison 3G UK Limited |
| Headquarters | Czechia | United Kingdom |
| Support channels | Chat, Phone | Help centre, Community |
Pros and cons
O2 CZ Datamanie
Pros
- Entry pricing starts at CZK 199 on prepaid billing.
- An eSIM, 5G and sim only are all available, so a handset you already own keeps working.
- No credit check is needed to start the line.
Cons
- Roaming in Europe runs on fair use terms rather than being included, so frequent travel abroad costs extra.
- Plan terms are 1 month, so plans renew on a short cycle with no longer term to hold a lower price.
- Service is confined to CZ, so the line does not travel beyond the Czech Republic.
SMARTY
Pros
- The entry plan is priced from £5 a month and bills on rolling terms.
- No annual price rises on the rolling monthly plans, so what you start on is what you renew on.
- An eSIM, 5G, wifi calling and hotspot sharing are all included.
Cons
- Support runs on help centre and community only, with no phone line for problems that need a voice.
- EU roaming works on a fair use basis, so a month abroad is not the same as a month at home.
- Coverage is fixed to Three because SMARTY is a virtual network operator, so there is no second host network to weigh.
Who each suits
O2 CZ Datamanie
Who it suits
- Readers in the Czech Republic who already have a phone and only need a line for calls and data.
- People who want to activate a prepaid line without a credit check or a long commitment.
- Travellers in Europe whose roaming is occasional rather than everyday.
Who should look elsewhere
- getesa, if you want a contract tariff alongside prepaid, since its billing options are prepaid and contract.
- yesss!, if you want rolling billing, since its billing options are contract, rolling and prepaid while this line is prepaid only.
- lonestar-cell-mtn, if you need a plan that serves a wider set of countries, since this line runs on CZ alone.
SMARTY
Who it suits
- People in GB who want to leave any month on a 1 month rolling term.
- Heavy data users who will pay £20 a month for the unlimited plan instead of watching a cap.
- Households running several lines, since a multi line discount is available.
Who should look elsewhere
- Buyers who would rather buy from the network's own brand: GETESA, Lonestar Cell MTN and yesss! are all network sellers, while SMARTY is a virtual network operator on Three.
- Frequent travellers who want roaming included, since fair use is the basis here and 48.2% of cheap plan listings include it outright.
- Anyone who needs a human voice on day one, since support runs on help centre and community only.
Country by country
| Country | O2 CZ Datamanie | SMARTY |
|---|---|---|
| Czechia | Yes | No |
| United Kingdom | No | Yes |
Questions about each
O2 CZ Datamanie
How much does O2 CZ Datamanie cost to start?+
Plans start at CZK 199 on prepaid billing, with plan terms of 1 month. Because billing is prepaid, you pay for the period you want and nothing beyond it, so no minimum spend has to be reached before the line is live.
What does the unlimited data plan cost?+
The Datamanie NEO plan gives unlimited data for CZK 499 and renews on a short cycle. If your data use swings from month to month, that flat cost removes the guessing, while the capped plan at CZK 199 suits steadier, lighter use.
SMARTY
How much is the cheapest SMARTY plan?+
SMARTY's entry plan starts at £5 a month and bills rolling, so there is no annual term to fund first. That figure is the monthly price from the start, not a headline rate that needs a discount code. Bigger allowances and unlimited data cost more.
How much is unlimited data at SMARTY?+
The unlimited plan costs £20 a month on rolling terms, and on the price lists it places 89 of 173 tracked brands, a stronger showing than its entry price. Heavy users get more here than the entry figure suggests.
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