Reference date: 4 September 2026. The prices below come from our daily price monitoring of all 12 SIM only providers in the Welcompare comparison. We look not only at the promotional price, but also at what you pay on average over the full contract period. We calculate that average for every offer and show it in the comparison. That way you avoid "€1 per month" teasers where you pay full price after a short promotional period.

There is no single best SIM only. It depends on how you use your phone. That is why we pick winners by use case, based on measurable data. At the top: the deal that combines everything.

🏆 Best deal of the month: 50+ mobiel, every 2-year bundle €2.50 per month

In September, too, the strongest deal comes from 50+ mobiel: choose a 2-year plan and every bundle costs €2.50 per month for the first 12 months, from 5,000 up to 75,000 MB, always with unlimited calls and texts. You are on Vodafone's 5G network with speeds up to 200 Mb/s and Dutch customer service. On the fairest measure, the average price over the full contract period, it also wins: on average €4.50 to €8.25 per month. Prefer a 1-year contract? Then you pay a fixed price without promotional tricks: from €7.50 (5,000 MB) to €15.00 (75,000 MB) per month. See the 50+ mobiel overview.

This month's strongest challenger is Simpel: 60,000 MB with unlimited calls (and 500 texts) for €1.00 per month for the first 12 months of a 2-year plan, €14.00 thereafter. That averages €7.50 per month over the full term, on the Odido network with speeds up to 150 Mb/s. An excellent deal, but on average price, speed and bundle choice 50+ mobiel keeps the lead.

Never think about your bundle again: unlimited, but mind the speed

With unlimited data it is not just the price that counts, but above all the speed.

  • Cheapest unlimited: Budget Mobiel, €10.00 per month (promotional price for the first 8 months of a 2-year plan; €20.00 thereafter, €16.67 on average), with a maximum speed of 25 Mbit/s. Fine for e-mail, apps, music and standard video. Not the choice for heavy streaming, large downloads or hotspot use.
  • Unlimited at full speed: Vodafone, from €27.50 per month, with speeds up to 1 Gbit/s. That is €1.50 more than last month. Note: that price includes 150 calling minutes. Want unlimited calling too? KPN is the cheapest at €28.00 per month; at Vodafone it starts at €30.00.
  • The middle ground: Odido, fully unlimited (data, calls and texts) from €30.00 per month with speeds up to 400 Mb/s.

Best rated by customers: 50+ mobiel

Price is not everything. Looking at what customers themselves say, the picture is clear: 50+ mobiel scores 4.5 stars on Trustpilot, based on more than 48,500 verified reviews. That is both the highest score and by far the largest number of reviews of all SIM only providers in our overview; by comparison Simyo, named best provider by the Dutch Consumers' Association panel, sits at 3.9 stars on Trustpilot with over 7,300 reviews. In our own comparison 50+ mobiel also leads with a 4.5, rated by our in-house telecom experts on ordering process, network and customer service. See the 50+ mobiel overview.

Everything from the largest network itself: KPN

If you want to be with the network owner directly, with 5G priority, speeds up to 1 Gbit/s on top bundles and the most extensive service options, you pay a premium for it. KPN holds the highest expert score in our comparison at 4.7. See the KPN overview.

Also sharp this month

Youfone runs September promotions with 40,000 and 50,000 MB for €2.00 per month during the promotional period (300 minutes; €14.00 and €17.00 thereafter). Check the comparison for the average price over the full term before you decide. Hollandsnieuwe shares the lowest entry price with Simpel: €1.00 per month for the first 6 months for 40,000 MB/min/sms (€9.25 on average). Lebara starts at €3.30 for 40,000 MB on the KPN network. All current promotions with average prices are in the comparison.

How we pick the winners

Welcompare is an independent comparison site and monitors the prices and promotions of all 12 Dutch SIM only providers daily. The Best deal of the month is the strongest combination of promotional price, average price over the full term, bundle contents (data and minutes) and how long the price is fixed. For unlimited plans we weigh the maximum internet speed. Quality and service are assessed with our own rating system: a score per offer set by our in-house telecom experts, combined with Trustpilot scores as a market trust signal. This page is refreshed monthly; the comparison overview is always up to date.

Frequently asked questions

What is the best SIM only deal of September 2026?
50+ mobiel: with a 2-year plan, every bundle up to 75,000 MB with unlimited calls and texts costs €2.50 per month for the first 12 months, averaging €5.00 to €8.25 over the full contract period (reference date 4 September 2026).

What does unlimited data cost per month?
From €10.00 at Budget Mobiel (note: capped at 25 Mbit/s). Unlimited at full speed starts at €27.50 (Vodafone, up to 1 Gbit/s, with 150 minutes); fully unlimited including calls from €28.00 at KPN.