O2 Mobile Unlimited data SIM only deals
At Olimit, we help you compare the best unlimited SIM Only deals — all in one place.
Keep your phone, ditch the restrictions.
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If you want no limits on how much data you use, an unlimited data SIM Only deal is the smart choice.
Most UK networks now offer unlimited plans to suit different budgets, so you can stream, scroll, and stay connected without worrying about caps.
Olimit Tips & Tricks
Do I need unlimited data SIM Only deal?
Unlimited data SIMs offer complete freedom, but they often come at a higher monthly cost. Before you commit, think about your usage. The average UK mobile user only uses around 10GB of data per month, so if you mainly browse, message, and stream occasionally, a smaller data plan might save you money.
However, if you’re always streaming Netflix, gaming on the go, using your phone as a hotspot, or working remotely, an unlimited data plan could be the hassle-free option you need. At Olimit, we help you compare unlimited and capped SIM Only deals, so you can find the best match for your data habits and budget.
Can I use my unlimited data SIM abroad?
It depends on the network. Look for 
in the deal listings below — it will show you how much roaming data is included and which countries are covered.
Before you travel, always check your network’s roaming fair usage policy and whether your destination is included. At Olimit, we make it easy to compare unlimited SIM Only deals with roaming included, so you can stay connected abroad without unexpected charges.
Provider
Network
Data
Price
Contract Length
Roaming
Additional
Lebara SIM Only
for 3 Months,
37 Roaming Destinations
5GB
Austria 🇦🇹
Belgium 🇧🇪
Bulgaria 🇧🇬
Croatia 🇭🇷
Cyprus 🇨🇾
Czech Republic 🇨🇿
Denmark 🇩🇰
Estonia 🇪🇪
Finland 🇫🇮
France 🇫🇷
Germany 🇩🇪
Gibraltar 🇬🇮
Greece 🇬🇷
Guadeloupe 🇬🇵
Guyane (French Guiana) 🇬🇫
Hungary 🇭🇺
Iceland 🇮🇸
India 🇮🇳
Ireland 🇮🇪
Italy 🇮🇹
Latvia 🇱🇻
Liechtenstein 🇱🇮
Lithuania 🇱🇹
Luxembourg 🇱🇺
Malta 🇲🇹
Martinique 🇲🇶
Mayotte 🇾🇹
Netherlands 🇳🇱
Norway 🇳🇴
Poland 🇵🇱
Portugal 🇵🇹
Réunion 🇷🇪
Romania 🇷🇴
Slovakia 🇸🇰
Slovenia 🇸🇮
Spain 🇪🇸
Sweden 🇸🇪
Lebara SIM Only
for 3 Months,
37 Roaming Destinations
5GB
Austria 🇦🇹
Belgium 🇧🇪
Bulgaria 🇧🇬
Croatia 🇭🇷
Cyprus 🇨🇾
Czech Republic 🇨🇿
Denmark 🇩🇰
Estonia 🇪🇪
Finland 🇫🇮
France 🇫🇷
Germany 🇩🇪
Gibraltar 🇬🇮
Greece 🇬🇷
Guadeloupe 🇬🇵
Guyane (French Guiana) 🇬🇫
Hungary 🇭🇺
Iceland 🇮🇸
India 🇮🇳
Ireland 🇮🇪
Italy 🇮🇹
Latvia 🇱🇻
Liechtenstein 🇱🇮
Lithuania 🇱🇹
Luxembourg 🇱🇺
Malta 🇲🇹
Martinique 🇲🇶
Mayotte 🇾🇹
Netherlands 🇳🇱
Norway 🇳🇴
Poland 🇵🇱
Portugal 🇵🇹
Réunion 🇷🇪
Romania 🇷🇴
Slovakia 🇸🇰
Slovenia 🇸🇮
Spain 🇪🇸
Sweden 🇸🇪
Mozillion SIM Only
41 Roaming Destinations
0.5GB
🇫🇷 France
🇵🇹 Portugal
🇮🇪 Ireland
🇬🇷 Greece
🇵🇱 Poland
🇮🇹 Italy
🇩🇪 Germany
🇳🇱 Netherlands
🇧🇬 Bulgaria
🇨🇾 Cyprus
🇨🇭 Switzerland
🇧🇪 Belgium
🇸🇪 Sweden
🇭🇷 Croatia
🇭🇺 Hungary
🇲🇹 Malta
🇱🇹 Lithuania
🇷🇴 Romania
🇫🇮 Finland
🇨🇿 Czech Republic
🇳🇴 Norway
🇸🇰 Slovakia
🇦🇹 Austria
🇩🇰 Denmark
🇬🇮 Gibraltar
🇮🇸 Iceland
🇱🇻 Latvia
🇪🇪 Estonia
🇱🇺 Luxembourg
🇬🇵 Guadeloupe
🇸🇮 Slovenia
🇱🇮 Liechtenstein
🇬🇫 French Guiana
🇬🇬 Guernsey
🇮🇲 Isle of Man
🇯🇪 Jersey
🇲🇶 Martinique
🇷🇪 Réunion
🇸🇲 San Marino
🇫🇴 Faroe Islands
Mozillion SIM Only
41 Roaming Destinations
0.5GB
🇫🇷 France
🇵🇹 Portugal
🇮🇪 Ireland
🇬🇷 Greece
🇵🇱 Poland
🇮🇹 Italy
🇩🇪 Germany
🇳🇱 Netherlands
🇧🇬 Bulgaria
🇨🇾 Cyprus
🇨🇭 Switzerland
🇧🇪 Belgium
🇸🇪 Sweden
🇭🇷 Croatia
🇭🇺 Hungary
🇲🇹 Malta
🇱🇹 Lithuania
🇷🇴 Romania
🇫🇮 Finland
🇨🇿 Czech Republic
🇳🇴 Norway
🇸🇰 Slovakia
🇦🇹 Austria
🇩🇰 Denmark
🇬🇮 Gibraltar
🇮🇸 Iceland
🇱🇻 Latvia
🇪🇪 Estonia
🇱🇺 Luxembourg
🇬🇵 Guadeloupe
🇸🇮 Slovenia
🇱🇮 Liechtenstein
🇬🇫 French Guiana
🇬🇬 Guernsey
🇮🇲 Isle of Man
🇯🇪 Jersey
🇲🇶 Martinique
🇷🇪 Réunion
🇸🇲 San Marino
🇫🇴 Faroe Islands
Mozillion SIM Only
41 Roaming Destinations
0.75GB
🇫🇷 France
🇵🇹 Portugal
🇮🇪 Ireland
🇬🇷 Greece
🇵🇱 Poland
🇮🇹 Italy
🇩🇪 Germany
🇳🇱 Netherlands
🇧🇬 Bulgaria
🇨🇾 Cyprus
🇨🇭 Switzerland
🇧🇪 Belgium
🇸🇪 Sweden
🇭🇷 Croatia
🇭🇺 Hungary
🇲🇹 Malta
🇱🇹 Lithuania
🇷🇴 Romania
🇫🇮 Finland
🇨🇿 Czech Republic
🇳🇴 Norway
🇸🇰 Slovakia
🇦🇹 Austria
🇩🇰 Denmark
🇬🇮 Gibraltar
🇮🇸 Iceland
🇱🇻 Latvia
🇪🇪 Estonia
🇱🇺 Luxembourg
🇬🇵 Guadeloupe
🇸🇮 Slovenia
🇱🇮 Liechtenstein
🇬🇫 French Guiana
🇬🇬 Guernsey
🇮🇲 Isle of Man
🇯🇪 Jersey
🇲🇶 Martinique
🇷🇪 Réunion
🇸🇲 San Marino
🇫🇴 Faroe Islands
Lebara SIM Only
for 3 Months,
37 Roaming Destinations
30GB
Austria 🇦🇹
Belgium 🇧🇪
Bulgaria 🇧🇬
Croatia 🇭🇷
Cyprus 🇨🇾
Czech Republic 🇨🇿
Denmark 🇩🇰
Estonia 🇪🇪
Finland 🇫🇮
France 🇫🇷
Germany 🇩🇪
Gibraltar 🇬🇮
Greece 🇬🇷
Guadeloupe 🇬🇵
Guyane (French Guiana) 🇬🇫
Hungary 🇭🇺
Iceland 🇮🇸
India 🇮🇳
Ireland 🇮🇪
Italy 🇮🇹
Latvia 🇱🇻
Liechtenstein 🇱🇮
Lithuania 🇱🇹
Luxembourg 🇱🇺
Malta 🇲🇹
Martinique 🇲🇶
Mayotte 🇾🇹
Netherlands 🇳🇱
Norway 🇳🇴
Poland 🇵🇱
Portugal 🇵🇹
Réunion 🇷🇪
Romania 🇷🇴
Slovakia 🇸🇰
Slovenia 🇸🇮
Spain 🇪🇸
Sweden 🇸🇪
Lebara SIM Only
for 3 Months,
37 Roaming Destinations
30GB
Austria 🇦🇹
Belgium 🇧🇪
Bulgaria 🇧🇬
Croatia 🇭🇷
Cyprus 🇨🇾
Czech Republic 🇨🇿
Denmark 🇩🇰
Estonia 🇪🇪
Finland 🇫🇮
France 🇫🇷
Germany 🇩🇪
Gibraltar 🇬🇮
Greece 🇬🇷
Guadeloupe 🇬🇵
Guyane (French Guiana) 🇬🇫
Hungary 🇭🇺
Iceland 🇮🇸
India 🇮🇳
Ireland 🇮🇪
Italy 🇮🇹
Latvia 🇱🇻
Liechtenstein 🇱🇮
Lithuania 🇱🇹
Luxembourg 🇱🇺
Malta 🇲🇹
Martinique 🇲🇶
Mayotte 🇾🇹
Netherlands 🇳🇱
Norway 🇳🇴
Poland 🇵🇱
Portugal 🇵🇹
Réunion 🇷🇪
Romania 🇷🇴
Slovakia 🇸🇰
Slovenia 🇸🇮
Spain 🇪🇸
Sweden 🇸🇪
Lyca Mobile Sim
30 Roaming Destinations
5GB
🇦🇹 Austria
🇧🇪 Belgium
🇧🇬 Bulgaria
🇭🇷 Croatia
🇨🇾 Cyprus
🇨🇿 Czech Republic
🇩🇰 Denmark
🇪🇪 Estonia
🇫🇮 Finland
🇫🇷 France
🇩🇪 Germany
🇬🇷 Greece
🇭🇺 Hungary
🇮🇸 Iceland
🇮🇪 Ireland
🇮🇹 Italy
🇱🇻 Latvia
🇱🇮 Liechtenstein
🇱🇹 Lithuania
🇱🇺 Luxembourg
🇲🇹 Malta
🇳🇱 Netherlands
🇳🇴 Norway
🇵🇱 Poland
🇵🇹 Portugal
🇷🇴 Romania
🇸🇰 Slovakia
🇸🇮 Slovenia
🇪🇸 Spain
🇸🇪 Sweden
O2 Unlimited Data SIM Only Plans: Stay Connected with Flexibility and Speed
Looking for a SIM-only plan with unlimited data? O2 provides flexible, high-speed plans on its 4G and 5G networks, perfect for streaming, gaming, working remotely, or browsing endlessly on your mobile device. With unlimited UK calls and texts and robust coverage across the UK, O2 unlimited SIM-only plans are ideal for both casual and heavy users.
Why Choose O2 Unlimited SIM Only?
- Unlimited Data: Stream, browse, and download without limits.
- Unlimited Calls & Texts: Stay in touch with unlimited UK minutes and messages.
- 5G Ready: Access O2’s growing 5G network for fast, seamless connectivity.
- Flexible Contracts: Options include rolling 30-day plans or longer contracts for added value and stability.
- eSIM Compatible: Activate your SIM digitally without a physical card.
- Priority Rewards: Exclusive perks, discounts, and experiences via O2’s Priority program.
- Tethering & Hotspot: Share your mobile data across multiple devices with ease.
Key Features of O2 Unlimited Plans
O2 unlimited SIM-only plans are packed with features designed for modern mobile users. These include:
- Incredible Roaming destinations when travelling
- Reliable UK coverage with excellent 4G and 5G network availability.
- High-speed internet ideal for streaming HD video, online gaming, and social media.
- Wi-Fi Calling and VoLTE for improved call quality in low-signal areas.
- Flexible data usage options to suit light, moderate, or heavy users.
- Support for multiple devices via tethering, ideal for working on the go or sharing with family members.
- Exclusive perks and offers through O2 Priority, including early access to events, discounts, and experiences.
Frequently Asked Questions About O2 Unlimited SIM Plans
Q: Can I keep my number when switching to O2?
A: Yes, by requesting a PAC code from your current provider, you can seamlessly transfer your number to O2.
Q: Are there credit checks for O2 SIM-only plans?
A: Pay Monthly unlimited plans require a credit check, but Pay As You Go options do not.
Q: Can I share my O2 unlimited data with other devices?
A: Yes, tethering and mobile hotspot are supported on all unlimited plans.
Q: Are these plans 5G ready?
A: All unlimited SIM-only plans from O2 are compatible with 5G networks where coverage is available.
Q: Can I use my O2 SIM abroad?
A: O2 offers roaming services in many countries. Users should check O2’s website for current roaming coverage and conditions.
Q: Can I cancel my O2 SIM-only plan anytime?
A: Rolling 30-day plans allow cancellation at any time without penalties, while longer contracts may have exit terms.
How to Choose the Right O2 Unlimited Plan
- Assess your typical data usage to determine if an unlimited plan is suitable.
- Decide between 30-day rolling plans for flexibility or longer contracts for potential added value.
- Check for additional features like Wi-Fi calling, tethering, and O2 Priority perks.
- Compare with other providers to ensure optimal coverage, speed, and service quality.
Compare Other Unlimited SIM-Only Deals
If O2 Unlimited isn’t right for you, explore other UK unlimited SIM-only providers:
- Three Unlimited SIM Only Plans
- EE Unlimited SIM Only Plans
- Vodafone Unlimited SIM Only Plans
- Lyca Mobile Unlimited SIM Only Deals
- Lebara Unlimited SIM Only Plans
- Smarty Unlimited SIM Only Plans
- Talkmobile Unlimited SIM Only Deals
- iD Mobile Unlimited SIM Only Deals
- 1p Mobile Unlimited SIM Only Deals
- Voxi Unlimited SIM Only Plans