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SMARTY SIM Only Plan Review: Flexible unlimited monthly SIM explained

SMARTY Unlimited SIM Only 1-month flexible plan
4.7
[Unlimited Data & Calls]  Unlimited data, calls and texts for just £20/month.
[Monthly Rolling Plan]  Leave anytime — commitment-free, no long-term contract.
[No Annual Price Rises]  No annual price increases; your bill won't unexpectedly rise.
[EU Roaming Included]  Up to 12GB EU roaming included for travel without extra charges.
[Keep Your Number]  Switch easily and keep your existing number, no number change needed.
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SIM-only mobile plan offering unlimited data, calls and texts with month-to-month flexibility. The SMARTY SIM Only Plan gives peace of mind for travellers and anyone who prefers predictable bills and no long ties. Is the flexibility and included EU roaming allowance right for your mobile needs?

⚡ At a Glance
  • Data Allowance: Unlimited data, calls and texts
  • Best for: Users who want month-to-month flexibility and predictable bills
  • Not ideal for: Customers seeking multi-year contracts or bundled handset deals

A rolling one-month SIM plan with unlimited voice, text and data. Includes up to 12GB of EU roaming and a promise of no annual price rises.


Unlimited everyday usage - with unlimited data, calls and texts

Allowance covers mobile data, voice calls and SMS without per-month caps, supplied on a SIM-only basis. Usage is measured per billing cycle rather than by small daily limits.

Stream music, use maps and call without monitoring gigabytes closely, ideal for heavy everyday mobile use.

Month-to-month freedom - thanks to the one-month flexible plan

Billing renews every month and the plan can be ended at the end of the billing period, so no long-term contract applies. Cancellation simply stops the next renewal.

Switch networks or pause service without penalty, useful for people who travel, test providers or avoid long commitments.

Predictable bills and EU support - with a no-annual-increase policy and 12GB roaming

Price policy guarantees no annual price rises and the plan includes a separate allowance of up to 12GB for use while roaming within the EU. Roaming allowance applies during travel in EU countries.

Avoid surprise bill hikes year-to-year while retaining a sensible roaming allowance for trips across the EU.

✨ The 4 Key Reasons for SMARTY SIM Only Plan
  1. Flexible monthly term – Leave at the end of any month, no long contract
  2. Price freeze promise – No annual increases, bills remain steady and predictable
  3. EU roaming included – Use up to 12GB while travelling across EU countries
  4. Number porting made easy – Keep your existing number when switching, no new number needed
📋 Technical Details at a Glance
  • Plan Type: SIM only, rolling monthly
  • Allowance: Unlimited data, calls and texts
  • Contract Length: One-month flexible, cancel at end of month
  • Price Policy: No annual price rises
  • EU Roaming: Up to 12GB included in EU
❓ Frequently Asked Questions

Q: Can I cancel the plan at any time?

A: Yes, the plan is commitment-free and can be ended at the end of any monthly billing period.

Q: Does the plan include EU roaming?

A: Yes, up to 12GB of EU roaming is included for use while travelling within EU countries.

Q: Can I keep my current phone number when I switch?

A: Yes, switching is straightforward and keeping an existing number is supported.

🏆 Our Verdict

Perfect for people who want unlimited calls, texts and data without a long contract, and for travellers who need a roaming allowance. The main selling point is the combination of unlimited usage, monthly flexibility and a promise of no annual price rises. Good long-term value for anyone prioritising predictable bills and freedom to switch networks.