Cheapest Prepaid SIM Card Ireland 2026: Compare & Save

If you’re looking to cut your mobile bill in Ireland, prepaid SIMs are the obvious answer. The good news: there are more no-contract options than ever, but the cheapest plan isn’t always the one with the lowest price tag. In this comparison, we break down the real costs and trade-offs from Lycamobile, Tesco Mobile, Three, and Vodafone so you can pick the right prepaid SIM for your stay or daily life.

Cheapest monthly prepaid plan: from Lycamobile (contract-free) ·
Highest data allowance under €20: 20GB on Tesco Mobile Clubcard SIM ·
Lowest entry cost for a SIM: free with some providers ·
Most popular no-contract provider: Lycamobile (contract-free)

The pattern: prepaid SIM value in Ireland clusters around the €20 mark for unlimited data, but the cheapest entry point comes from providers that keep pricing deliberately vague.

What is the cheapest SIM card in Ireland?

Pinning down a single “cheapest SIM” is tricky because providers change offers frequently. Based on current data, Lycamobile stands out as the only major provider explicitly advertising contract-free prepay plans with no minimum commitment (Lyca Mobile Ireland). Their pay-as-you-go bundles start from a low base, though exact pricing for the lowest tier is not published in a standard format. Tesco Mobile’s entry-level SIM-only deal is €20 for a 5G Clubcard SIM with a 28-day top-up cycle (Tesco Mobile Ireland). For pure data value, most Irish providers offer unlimited plans for around €20 per month (Wise). The cheapest prepaid SIM overall, therefore, is not a single product but rather the cheapest plan that matches your usage pattern.

Overview of cheapest providers

• Lycamobile: Contract-free, pay-as-you-go and SIM-only options with unlimited data, international calling, and EU roaming (Lyca Mobile Ireland).
• Tesco Mobile: €20 5G Clubcard SIM (28-day top-up), no contract (Tesco Mobile Ireland). Also offers a €30 Elevate SIM with unlimited data on a 12-month contract (Tesco Mobile Ireland).
• Three: Bill-pay SIM Core plan starts at €20 for 6 months then €30 (not prepaid) (Three Ireland). Three does offer prepay options, but details are limited.
• Vodafone Ireland: Prepaid SIMs for longer stays with four-week validity, priced between €20 and €30 (Holafly).

Lycamobile vs Tesco vs Three vs Aldi

Three of the four providers have clear pricing data; Aldi Mobile is a known entity but no specific plan details appeared in our research. SmartSaver.ie lists Aldi Mobile alongside other networks, but does not publish a direct comparison. The table below summarises what we know.

The implication: shoppers must cross-reference multiple sites to get the full picture, since no single source compiles Aldi’s current prepaid pricing.

What’s the cheapest pay-as-you-go SIM?

Pay-as-you-go (PAYG) SIMs typically charge per minute or per text rather than a monthly bundle. Lycamobile’s PAYG tariffs start at low per-minute rates, though exact figures are not published online (Lyca Mobile Ireland). Tesco Mobile’s prepaid top-up model gives you a large allowance for a single top-up: €15 gets you 3,000 minutes and 3,000 texts, plus 5G data (specific data amount not stated) (Tesco Mobile Ireland). Three’s pay-as-you-go rates vary by plan, but their SIM Core is bill-pay only (Three Ireland). For calls-heavy users, Tesco Mobile’s €15 top-up offers excellent value.

The catch: Tesco’s generous minute-and-text allowance comes without a clearly stated data cap, which matters for data-dependent users.

Best pay-as-you-go SIMs for calls and data

• Lycamobile: Low per-minute cost, contract-free, includes EU roaming (Lyca Mobile Ireland).
• Tesco Mobile: €15 top-up gives 3,000 minutes and texts plus data (Tesco Mobile Ireland).
• Vodafone: Prepaid plans from €20 to €30 with four-week validity (Holafly).

“Our prepay plans are contract-free.” – Lyca Mobile Ireland (official site)

Can I buy a SIM card without a monthly contract?

Yes. All major Irish networks offer prepaid SIMs that require no monthly commitment. Lycamobile explicitly markets its prepay plans as contract-free (Lyca Mobile Ireland). Tesco Mobile’s SIM-only plans are available on a 28-day top-up cycle with no long-term tie-in (Tesco Mobile Ireland). Three’s prepay SIMs also exist, though their marketing focuses on bill-pay. Switcher.ie aggregates prepay options from all Irish networks, including 30-day and no-contract deals.

How to purchase a prepaid SIM

Prepaid SIMs are sold at retail stores (Tesco, Aldi), online from the network, or from comparison sites like SmartSaver.ie. No credit check is required – you buy the SIM, top up, and use it.

The pattern: buying a no-contract SIM in Ireland is straightforward, but the lack of standardised pricing across retailers means a quick online check before visiting a store pays off.

What is the Three €30 plan?

Three Ireland’s SIM Core plan is a bill-pay SIM-only offer, not prepaid. It costs €20 per month for the first six months, then increases to €30 per month (Three Ireland). The plan includes 35GB of data with EU roaming and 5G capability. After the six-month discount, the price jumps significantly. For a truly cheap prepaid alternative, Lycamobile or Tesco Mobile offer better value for data users.

The catch: Three’s discount period locks you into a bill-pay contract, making it a poor choice for anyone seeking genuine prepaid flexibility.

Alternatives to Three’s €30 plan

• Lycamobile: Contract-free plans with unlimited data options (price not specified).
• Tesco Mobile: €20 for 20GB 5G Clubcard SIM (28 days).
• Vodafone: €20–€30 prepaid plans with 4-week validity (Holafly).

How much is a SIM card at Aldi?

Aldi Mobile SIM cards are available in Aldi stores across Ireland, but specific pricing for 2026 is not published in our research. Switcher.ie includes Aldi Mobile in its comparison list, suggesting plans start from a low entry point. Given Aldi’s reputation for low prices, a SIM card likely costs a few euros or may even be free with a top-up. The exact data allowances are not confirmed.

Aldi Mobile pricing overview

Based on historical pricing and comparisons, Aldi Mobile plans are typically under €10 per month for basic data. However, without a 2026 source, we cannot confirm.

Comparison: Cheapest prepaid SIMs in Ireland (2026)

Four providers, four different approaches to value. This table puts them side by side.

What this means: Lycamobile and Tesco Mobile are the strongest contenders for cheapest prepaid SIM. Three’s plan is not prepaid and Vodafone’s pricing remains vague.

Pros and Cons of prepaid SIMs in Ireland

What’s confirmed and what’s unclear

Confirmed facts

• Lycamobile offers contract-free prepay plans (Lyca Mobile Ireland)
• Tesco Mobile sells a €20 5G Clubcard SIM (Tesco Mobile Ireland)
• Three’s SIM Core is bill-pay, not prepaid (Three Ireland)
• Most Irish providers have unlimited data plans around €20 (Wise)

What’s unclear

• Exact cheapest monthly price for Lycamobile’s basic plan
• Specific data allowances for Vodafone prepaid plans
• Aldi Mobile’s 2026 pricing

Reader experiences with prepaid SIMs

“For best value, check Lycamobile or Tesco. They’re both cheap and reliable.” – Reddit user on r/AskIreland

“Our prepay plans are contract-free and include unlimited data, international calling, and EU roaming.” – Lyca Mobile Ireland

The pattern from these experiences: Lycamobile and Tesco Mobile are the go-to choices for prepaid users. Three’s bill-pay dominance means tourists and short-term residents should stick with the two main prepaid players.

For anyone visiting or living in Ireland on a budget, the choice is clear: pick Lycamobile if you want the flexibility of a contract-free plan with unlimited data, or Tesco Mobile if you want a fixed low price with a decent data allowance. Three and Vodafone are options, but they either require a contract or lack transparent pricing. The cheapest prepaid SIM in Ireland for 2026 is not a single product – it’s the one that fits your usage pattern and doesn’t lock you in.

Frequently asked questions