SmartSaver.ie's head-to-head comparison of Eir Mobile and Three Ireland. The numbers below come from SmartSaver.ie's daily price checks (as of 2026-08-17).
Both run their own networks, so this is a genuine infrastructure choice rather than a reseller comparison. Eir's network has the edge in rural coverage and its prepay pricing is aggressive; Three counters with the largest 5G footprint in Ireland and unlimited data on almost every plan. If you're outside the cities or want the cheapest prepay route, lean Eir. If you burn through data or want 5G everywhere it exists, lean Three, but check the live prices below, because both move often.
| Measure | Eir Mobile | Three Ireland |
|---|---|---|
| Cheapest plan | €14.99/mo (Unlimited, promo) | €14/mo (Unlimited, promo) |
| Standard price after promo | €29.99/mo | €28/mo |
| Cheapest unlimited data | €14.99/mo (promo) | €14/mo (promo) |
| 5G included | Yes | Yes |
| Network | Own network (Eir) | Own network (Three) |
| Coverage | 99% population (own network) | 99% population (own network) |
| Trustpilot | 1.5/5 | 1.4/5 |
| Plans listed | 2 | 6 |
Three Ireland currently has the cheaper entry plan, €14/month vs €14.99/month. Promotional pricing applies for an intro period. See the standard price in the table. Prices are checked daily on both providers' websites.
Eir Mobile: its own network (Eir). Three Ireland: its own network (Three).
Eir Mobile: yes, 5G is included on current plans. Three Ireland: yes, 5G is included on current plans.