They are rarely genuinely free.
- **Incoming SMS:** Typically, incoming SMS are free in roaming.
- **MTS Tariff 'Налегке':** This zero-monthly-fee tariff can be activated via the personal account in a web browser (not available in the app). Crucially, disable any auto-activated 'Always on ease' (Всегда налегке) or similar services immediately after activation to prevent daily charges (e.g., 12 rubles).
- **Megafon:** Offers tariffs as low as 10 rubles per month, or users can simply send one SMS per month to maintain number activity.
- **Strategy for infrequent use:** Keep the SIM in a secondary phone, turning it on only for necessary SMS, and maintain a minimal balance to prevent unexpected charges.
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