We Chose The Best Sim Only Deals 25gb in The UK - 10/2025

Best Choice

O2 Prepaid Data Sim Card. 25GB of 4G/5G Data for use in over 70+ Countries Worldwide (Valid for 30 Days).Easy to Renew. Includes USA, Canada, Australia, South Africa & Europe.

O2 Prepaid Data Sim Card. 25GB of 4G/5G Data for use in over 70+ Countries Worldwide (Valid for 30 Days).Easy to Renew. Includes USA, Canada, Australia, South Africa & Europe.

Sims4Travel

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Why we love it

Global coverage in 70+ countries.
No roaming fees worries.
Outstanding customer service availability.

Main Highlights

WHAT YOU GET: A Prepaid/preloaded O2 Sim Card with 25GB of 4G/5G roaming data for use in 70+ countries worldwide. Includes USA, Canada, Australia, South Africa and Europe. See the full country list in the description below.
UNLIMITED DATA SPEEDS: this sim comes with 25GB of 4G/5G data, with no speed restrictions. Enjoy super-fast 4G/5G data speeds + free mobile hotspot/tethering + compatible with VOIP services.
HOW YOU GET IT: You receive a 3-in-1 Sim card that includes standard/micro/nano sizes. Activate the sim via an emil/call to Sims4Travel then insert the sim into your device. You can activate the sim before you travel or as soon as you arrive at one of the 70+ countries listed below. Either way, your sim is ready to use within an hour of activation.
WHO SHOULD GET IT? Anyone who hates roaming fees when travelling. Keep connected with no hidden costs
CUSTOMER SERVICE: We care about our customers. We're available 7 days a week to assist you, call, email or video chat. We take pride in your connectivity
LEGAL STUFF: Capable device required. No Personal ID required
EUROPEAN ROAMING COUNTRIES: Albania, Austria, Belgium, Bulgaria, Canary Islands, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Faroe Islands, Finland, France, French Territories, Germany, Gibraltar, Greece, Hungary, Iceland, Ireland, Italy (including Vatican City), Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Monaco, Netherlands, Norway, Poland, Portugal (including Madeira), Romania, Slovakia, Slovenia, Spain (including. Balearic Islands), Sweden, Channel Islands (including Guernsey
REST OF THE WORLD ROAMING COUNTRIES: Anguilla, Antigua, Aruba, Australia, Barbados, Bermuda, Bosnia & Herzegovina, Canada, Cayman Islands, Dominica, Ghana, Grenada, Jamaica, Kenya, Lesotho, Mexico, Montserrat, Mozambique, Netherland Antilles, New Zealand, South Africa, St Kitts and Nevis, St Vincent, St Lucia, Trinidad & Tobago, Turks and Caicos, UK Virgin Islands, USA.

9.9

Exceptional

9.9

Exceptional

Sims4Travel

O2 Prepaid Data Sim Card. 25GB of 4G/5G Data for use in over 70+ Countries Worldwide (Valid for 30 Days).Easy to Renew. Includes USA, Canada, Australia, South Africa & Europe.

Free Shipping

Why we love it

Global coverage in 70+ countries.
No roaming fees worries.
Outstanding customer service availability.

Main Highlights

WHAT YOU GET: A Prepaid/preloaded O2 Sim Card with 25GB of 4G/5G roaming data for use in 70+ countries worldwide. Includes USA, Canada, Australia, South Africa and Europe. See the full country list in the description below.
UNLIMITED DATA SPEEDS: this sim comes with 25GB of 4G/5G data, with no speed restrictions. Enjoy super-fast 4G/5G data speeds + free mobile hotspot/tethering + compatible with VOIP services.
HOW YOU GET IT: You receive a 3-in-1 Sim card that includes standard/micro/nano sizes. Activate the sim via an emil/call to Sims4Travel then insert the sim into your device. You can activate the sim before you travel or as soon as you arrive at one of the 70+ countries listed below. Either way, your sim is ready to use within an hour of activation.
WHO SHOULD GET IT? Anyone who hates roaming fees when travelling. Keep connected with no hidden costs
CUSTOMER SERVICE: We care about our customers. We're available 7 days a week to assist you, call, email or video chat. We take pride in your connectivity
LEGAL STUFF: Capable device required. No Personal ID required
EUROPEAN ROAMING COUNTRIES: Albania, Austria, Belgium, Bulgaria, Canary Islands, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Faroe Islands, Finland, France, French Territories, Germany, Gibraltar, Greece, Hungary, Iceland, Ireland, Italy (including Vatican City), Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Monaco, Netherlands, Norway, Poland, Portugal (including Madeira), Romania, Slovakia, Slovenia, Spain (including. Balearic Islands), Sweden, Channel Islands (including Guernsey
REST OF THE WORLD ROAMING COUNTRIES: Anguilla, Antigua, Aruba, Australia, Barbados, Bermuda, Bosnia & Herzegovina, Canada, Cayman Islands, Dominica, Ghana, Grenada, Jamaica, Kenya, Lesotho, Mexico, Montserrat, Mozambique, Netherland Antilles, New Zealand, South Africa, St Kitts and Nevis, St Vincent, St Lucia, Trinidad & Tobago, Turks and Caicos, UK Virgin Islands, USA.

We scanned 767 products

We reviewed these offers relevant to the Sim Only Deals 25gb within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Sims4Travel, SimRush, OneCall, talk all day, Giffgaff, SMARTY, EE, Vodafone, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Sim Only Deals 25gb in the market, we considered we took a deep dive into 3836 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is O2 Prepaid Data Sim Card. 25GB of 4G/5G Data for use in over 70+ Countries Worldwide (Valid for 30 Days).Easy to Renew. Includes USA, Canada, Australia, South Africa & Europe.. We love many things about this product by Sims4Travel. What sets it apart from the competition is Global coverage in 70+ countries, No roaming fees worries, Outstanding customer service availability.

The best value product for most shoppers and where user satisfaction is continuously the highest is UNLIMITED UK DATA SIM and UNLIMITED MINUTES + SMS - 4G/5G O2 SIM card - Prepaid Sim, Not Pay as You Go. 25GB EU Roaming. Perfect for EU Holidays or Working Away from Home! (30 days). by SimRush based on online reviews by bloggers, experts and online shoppers.

The biggest bargain at the moment for Sim Only Deals 25gb and the best cost-to-value ratio is EE 25GB Pay As You Go SIM Cardat EE with a 70% discount.

Our list of the best Sim Only Deals 25gb is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.

Best Sim Only Deals 25gb of 2025

We scanned 767 products

We concluded that: