On the plan Sky edges it: cheaper unlimited, cheaper floor, rollover, unlimited roaming on the plans we list, and no April rise. Vodafone wins on the things only the operator can sell: a shop, a phone line, a handset on the bill, and the person who actually fixes a fault. If the Vodafone radio itself is the problem at your address, neither SIM fixes it — check the ComReg coverage map and look at Three or Eir instead.
One more thing neither brand wants in the headline. If you want these Vodafone masts and do not care whose logo is on the SIM, Clear is €12.99 unlimited 5G rolling on exactly the same radio, with no 12-month term and no April rise. This page is Sky versus Vodafone as sold; the cheap answer is one click away.
Quick comparison
Side by side from published August 2026 prices and contract terms. Green highlights the better figure on each measurable row.
| Sky Mobile | Vodafone | |
|---|---|---|
| Our score | 8.8 | 8.5 |
| Intro from | €10 | €15 |
| Thereafter from | €10 | €15 |
| Headline data | Unlimited | Unlimited |
| Host network | Vodafone network | Vodafone network |
| Annual rise | No | Yes |
| eSIM | Yes | Yes |
| Kind | MVNO | MNO |
Price: Sky is €10 or €12.99, Vodafone starts at €15 and climbs to €35
Sky Mobile lists two SIM-only plans: 10 GB at €10 and unlimited at €12.99, advertised as “was €15, now €12.99”, both 12 months. Confirm the post-term price on the order summary. Vodafone’s SIM-only ladder runs Red Unlimited SIM Only 15 at €15, Red Start and Red Unlimited 25 at €25, Red Lite at €30 and Ultra at €35. Every Vodafone row is unlimited 5G. The extra money buys roaming allowance, international calls and rewards, not more Irish data.
So the like-for-like fight is €12.99 against €15. Over the 12-month term that is €155.88 on Sky against €180 on Vodafone before the April adjustment, which adds €2.50 a month to whatever is left of the term. Sky’s second price advantage is the €10 row: a light user on Vodafone has no cheaper SIM-only option than €15, so Sky saves €60 a year for anyone who lives on Wi-Fi.
Vodafone has a half-price SIM-only promotion at the time of writing, €17.50 a month for six months on an unlimited plan, which reverts to the standard rate. Promo maths for the whole market is in cheapest mobile in Ireland.
Network: same Vodafone radio, different bill
This is the row most people expect to decide it, and it does not. Sky Mobile is an MVNO on Vodafone — a long-term wholesale partnership named in Sky Group’s September 2024 launch release — so a Sky SIM and a Vodafone SIM connect to the same masts, the same spectrum and the same 5G layer, at about 98 per cent population coverage. If Vodafone drops to one bar in your back bedroom, so does Sky. If Vodafone is strong, so is Sky. Swapping between them changes the bill, not the bars.
So the phone test here is a single phone. Borrow one on Vodafone, Clear or An Post Mobile — all Vodafone radio — and check the rooms you use. If it works, both of these SIMs work. If it does not, neither does, and you should be reading about 48 on Three or GoMo on Eir instead; our rural mobile guide covers where the three radios diverge county by county.
What the operator keeps for itself is the service around the radio. Vodafone advertises Wi-Fi calling on its own bill-pay plans; Sky’s Irish plan page does not make the same promise, so confirm it before you rely on it for a house with no bars indoors. When the network has a fault, a Vodafone customer is talking to the operator, while Sky can only raise it with Vodafone on your behalf. For most people that never comes up. For a farm office on one bar, it does.
Data: Piggybank rollover versus unlimited everything
Vodafone’s SIM-only plans are all unlimited with fair use, so data is a non-event: you never run out and nothing rolls over because there is nothing to roll. Sky’s unlimited plan is the same story with one twist. Sky puts 5 GB into your Piggybank every month on unlimited, and on the 10 GB plan every unused gigabyte goes in. Piggybank data keeps for up to three years and can be used to top up your own SIM, shared with other Sky Mobile SIMs on the account, or swapped for rewards.
That matters for one type of customer: the household with two or three Sky SIMs where one person uses 2 GB a month and another uses 30 GB. The light user’s €10 plan quietly funds the heavy one. A single Vodafone unlimited SIM cannot do that; you pay €15 per person whether they use it or not.
If you are not sure whether 10 GB is enough, how much data do I need walks through it. Most people who say they need unlimited use under 20 GB.
Contract: both 12 months, only one has an April price adjustment
Both are 12-month SIM-only contracts. Neither is a rolling plan. Sky’s plan page says standard pricing applies after the minimum term; the unlimited plan is advertised as cut from €15 to €12.99, so check what month 13 costs on the order summary. Leave early and you owe the remaining months, on either brand. Both offer eSIM — Sky at checkout, Vodafone on bill pay — so that is no longer a reason to pick one over the other.
The difference is Vodafone’s annual price adjustment. Vodafone’s own page lists a fixed €2.50 a month increase every April on SIM-only bill pay for customers who signed up or upgraded from 16 October 2024, applied inside the contract as well as after it. Customers on older contracts get CPI plus 3 per cent, which worked out at 5.8 per cent in April 2026. So a €15 Red Unlimited signed in, say, October becomes €17.50 the following April with six months of the term still to run. Sky’s plan page carries no equivalent clause. Read the order summary on both before you sign; the rules are in price for life.
If the 12-month term itself is the problem, neither brand is the answer. No-contract mobile lists the rolling options on both radios.
Roaming: Sky says no limit, Vodafone says included with a cap
Sky’s Roam Like Home covers the EU and the UK on both plans, with unlimited calls and texts while away. On the unlimited plan Sky’s own page says it imposes no data limit when roaming, which is unusually generous; on the 10 GB plan you use your 10 GB plus Piggybank. The UK inclusion matters for anyone crossing to the North or flying to Britain, because post-Brexit the UK is not covered by the EU roam-like-home rules and several Irish operators charge for it.
Vodafone includes EU roaming on every SIM-only plan we list, subject to a fair-use allowance that scales with the tier; Ultra at €35 lists 80 GB and adds unlimited international calls. Vodafone’s roaming is solid and the operator-grade network agreements abroad are a real advantage in remote corners of Europe. But at the €15 tier you are reading a fair-use footnote, where Sky is not.
The regulator’s side of this, including what fair use can legally mean, is in EU roaming explained. If you travel more than a few weeks a year, best mobile for roaming ranks the whole market on it.
Who it's for: the Sky household versus the Vodafone coverage buyer
Sky Mobile is for the house that already pays Sky for TV or broadband and wants mobile on the same account, for the under-user who will bank data, for anyone who wants unlimited 5G for €12.99 on a fixed price, and for the regular traveller who wants the roaming row to read “no limit”. We could not find a listed euro discount for existing Sky TV or broadband customers on the mobile plan page, so the bundle win is convenience and Sky VIP rather than a cheaper line rental.
Vodafone is for anyone who wants to deal with the operator directly, for the house that wants a phone financed on the bill, and for households building around Vodafone broadband. Vodafone has historically discounted mobile for its broadband customers; at the time of writing its offers page leads with a €75 bill credit on 24-month broadband rather than a flat monthly mobile discount, so ask for the exact figure before you count it.
And if you only want these Vodafone masts at the lowest price, skip both and take Clear at €12.99 unlimited rolling — same radio as Sky and Vodafone, no 12 months, no April rise. Clear against its host is in 48 vs Clear, and Vodafone against another €15 SIM is in Virgin vs Vodafone.
Which should you choose?
It comes down to cost profile, host network fit, and contract style. Use this fast decision frame.
Choose Sky Mobile if
You already pay Sky for TV or broadband and want one account, you want unlimited 5G for €12.99 rather than €15, you under-use data and Piggybank will actually bank something, or you roam in the EU and UK often and want no GB cap to read. You are happy to get Vodafone’s signal without Vodafone’s shop.
Check Sky Mobile →
Choose Vodafone if
You want the operator rather than a reseller when something breaks, you want a handset on the bill or a shop to walk into, or you are building a Vodafone broadband household and can get a bundle price confirmed in writing. You accept a 12-month term and Vodafone’s April price adjustment.
Check Vodafone →Advertiser disclosure: we may earn a commission when you buy through links on this page. That never affects scores or the winner.
