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.
Most UK providers include EU roaming with unlimited data SIMs, but your usage abroad is usually capped — often between 12GB and 35GB per month. Some networks also charge extra for roaming outside the EU, like in the USA, Australia, or Asia.
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.
Promoted
Uses EE's network
data
£12.50
for 1 Month,
No Contract
31 Roaming Destinations
35GB
Austria 🇦🇹
Belgium 🇧🇪
Bulgaria 🇧🇬
Croatia 🇭🇷
Cyprus 🇨🇾
Czech Republic 🇨🇿
Denmark 🇩🇰
Estonia 🇪🇪
Finland 🇫🇮
France 🇫🇷
Germany 🇩🇪
Greece 🇬🇷
Hungary 🇭🇺
Iceland 🇮🇸
India 🇮🇳
Ireland 🇮🇪
Italy 🇮🇹
Latvia 🇱🇻
Liechtenstein 🇱🇮
Lithuania 🇱🇹
Luxembourg 🇱🇺
Malta 🇲🇹
Netherlands 🇳🇱
Norway 🇳🇴
Poland 🇵🇱
Portugal 🇵🇹
Romania 🇷🇴
Slovakia 🇸🇰
Slovenia 🇸🇮
Spain 🇪🇸
Sweden 🇸🇪
List of SIM Only deals
Networks Using:
Select By All Networks
Data
Price
Contract Length
Roaming Destinations
Additional
Uses Three's network
45 Roaming Destinations
Åland Islands 🇦🇽
Austria 🇦🇹
Azores 🇵🇹
Balearic Islands 🇪🇸
Belgium 🇧🇪
Bulgaria 🇧🇬
Canary Islands 🇮🇨
Comoros & Mayotte 🇾🇹
Croatia 🇭🇷
Cyprus 🇨🇾
Czech Republic 🇨🇿
Denmark 🇩🇰
Estonia 🇪🇪
Finland 🇫🇮
France 🇫🇷
French Guiana 🇬🇫
Germany 🇩🇪
Gibraltar 🇬🇮
Greece 🇬🇷
Guadeloupe 🇬🇵
Hungary 🇭🇺
Iceland 🇮🇸
Ireland 🇮🇪
Italy 🇮🇹
Latvia 🇱🇻
Lithuania 🇱🇹
Luxembourg 🇱🇺
Madeira 🇵🇹
Malta 🇲🇹
Martinique 🇲🇶
Netherlands 🇳🇱
Norway 🇳🇴
Poland 🇵🇱
Portugal 🇵🇹
Réunion 🇷🇪
Romania 🇷🇴
Saint Barthélemy 🇧🇱
Saint Martin 🇲🇫
San Marino 🇸🇲
Slovakia 🇸🇰
Slovenia 🇸🇮
Spain 🇪🇸
Sweden 🇸🇪
Vatican City 🇻🇦
of data
£8
12 Month Contract
of data
£12
12 Month Contract
of data
£10
12 Month Contract
Uses Vodafone's network
data
£12.50
for 3 Months,
No Contract
38 Roaming Destinations
30GB
Austria 🇦🇹
Belgium 🇧🇪
Bulgaria 🇧🇬
China 🇨🇳
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 🇸🇪
Uses Vodafone's network
of data
£9
for 3 Months,
12 Month Contract
38 Roaming Destinations
30GB
Austria 🇦🇹
Belgium 🇧🇪
Bulgaria 🇧🇬
China 🇨🇳
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 🇸🇪
Uses Vodafone's network
38 Roaming Destinations
30GB
Austria 🇦🇹
Belgium 🇧🇪
Bulgaria 🇧🇬
China 🇨🇳
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 🇸🇪
Uses Vodafone's network
of data
£6.75
for 3 Months,
12 Month Contract
38 Roaming Destinations
30GB
Austria 🇦🇹
Belgium 🇧🇪
Bulgaria 🇧🇬
China 🇨🇳
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 🇸🇪
Uses Vodafone's network
38 Roaming Destinations
30GB
Austria 🇦🇹
Belgium 🇧🇪
Bulgaria 🇧🇬
China 🇨🇳
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 🇸🇪
Uses Vodafone's network
of data
£4.50
for 3 Months,
12 Month Contract
38 Roaming Destinations
30GB
Austria 🇦🇹
Belgium 🇧🇪
Bulgaria 🇧🇬
China 🇨🇳
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 🇸🇪
Which UK Networks Unlimited Plans Are Really Unlimited?
Here’s a list of networks offering unlimited data SIM plans in the UK. These plans typically come without data limits when used domestically, but check each network’s fair use policy for roaming and tethering.
| Network | Unlimited Data SIM | Fair Usage Policy | Monthly Data Limit (Fair Usage) |
|---|---|---|---|
| Three | Yes | No significant restrictions | None |
| Vodafone | Yes | Speed may be reduced after 600GB usage | 600GB |
| O2 | Yes | Speed may be reduced after 650GB usage | 650GB |
| EE | Yes | Speed may be reduced after 600GB usage | 600GB |
| Smarty | Yes | No significant restrictions | None |
| iD Mobile | Yes | Speed may be reduced after 450GB usage | 450GB |
| VOXI | Yes | No significant restrictions | None |
| Lyca Mobile | Yes | Speed may be reduced after 450GB usage | 450GB |
| Tesco Mobile | Yes | No fixed fair usage policy | None (but speeds may be affected) |
| Asda Mobile | Yes | Speed may be reduced after 100GB usage | 100GB |
| Talkmobile | Yes | Speed may be reduced after 100GB usage | 100GB |
| Giffgaff | Yes | Speed may be reduced after 650GB usage | 650GB |
| Lebara Mobile | Yes | No significant restrictions | None |
| 1pMobile | Yes | Speed may be reduced after 500GB usage | 500GB |
| Spusu | Yes | No significant restrictions | None |
| Virgin Mobile | Yes | Speed may be reduced after 600GB usage | 600GB |
| Plusnet Mobile | Yes | Speed may be reduced after 600GB usage | 600GB |
| Penguin Mobile | Yes | Speed may be reduced after 600GB usage | 600GB |
| FreedomPop | Yes | Speed may be reduced after 100GB usage | 100GB |
Do I Need an Unlimited Data SIM?
Depends on your usage! If you rely on Wi-Fi or don’t stream videos over mobile, you likely won’t need unlimited data. However, if you frequently stream, video call, or use data-intensive apps, unlimited data could save you from potential extra charges.
Sample Data Usage for 1GB
- Stream 2 hours of standard video
- Stream 10 hours of music
- Upload 500 photos
- Browse online for 30 hours
- Send 1 million messages
- Play online games for 3-30 hours
Can I Use Unlimited Data Abroad?
Typically, no—limits apply abroad, with amounts varying by network. Here’s a quick guide:
Always verify with your network for up-to-date limits.
Tethering and Data-Only SIM Options
- Tethering: All networks allow tethering with unlimited data plans in the UK, but check for fair usage limits when traveling abroad.
- Data-Only SIMs: Available from networks like Three, O2, Vodafone, and Smarty. Alternatively, you can place a phone SIM in a broadband dongle, though call/text functionality would be lost.
Network Restrictions
Some networks enforce fair usage policies even on “unlimited” plans. Here are a few examples:
- Three, Vodafone, Tesco Mobile and Talkmobile: No general fair usage policy.
- EE: Up to 600GB/month, tethering to 11 devices.
- O2: Up to 650GB/month, tethering to 11 devices.
- Lyca Mobile: Up to 450GB/month.
Check your chosen network’s policy for the latest details.
UK Mobile Networks and Their Providers
Key:
- MNO (Major Network Operators): Networks that own their infrastructure (EE, O2, Vodafone, Three).
- MVNO (Mobile Virtual Network Operators): Providers that use the infrastructure of an MNO to offer their own services (e.g., Giffgaff, Tesco Mobile, Talkmobile).
| Provider | Type | Network Used |
|---|---|---|
| EE | MNO | EE (Owned by BT) |
| O2 | MNO | O2 (Owned by Telefonica) |
| Vodafone | MNO | Vodafone Group |
| Three | MNO | Three (Owned by Hutchison 3G) |
| Giffgaff | MVNO | O2 |
| Tesco Mobile | MVNO | O2 |
| Sky Mobile | MVNO | O2 |
| Talkmobile | MVNO | Vodafone |
| iD Mobile | MVNO | Three |
| VOXI | MVNO | Vodafone |
| Smarty Mobile | MVNO | Three |
| Lyca Mobile | MVNO | O2 |
| Lebara Mobile | MVNO | Vodafone |
| Asda Mobile | MVNO | Vodafone |
| 1pMobile | MVNO | EE |
| Spusu | MVNO | Three |
| Virgin Mobile | MVNO | EE |
| Plusnet Mobile | MVNO | EE |
| Penguin Mobile | MVNO | EE |
| FreedomPop | MVNO | EE |
Key Points:
- EE: Known for wide coverage, many networks leverage its infrastructure, including BT Mobile and Plusnet.
- O2: Popular for customer-friendly policies, used by Tesco Mobile, Sky Mobile, and GiffGaff.
- Vodafone: Offers high-speed 5G and is used by VOXI, Lebara, and Virgin Mobile.
- Three (3): Known for competitive pricing, supports iD Mobile and Smarty.
Additional Benefits on Each Network
- Inclusive Roaming: Some networks, like O2, Tesco, Smarty, and Lyca Mobile, offer roaming as standard, while others may limit it to premium plans.
- 5G Coverage: Coverage varies, so use a network’s coverage checker to confirm availability in your area.
- Extras: Certain plans include perks such as Spotify, Amazon Prime, or YouTube Premium on Vodafone, and entertainment bundles on EE.
Switching Networks and Keeping Your Number
- Check if you’re out of contract by texting “INFO” to 85075.
- Get a PAC code by texting “PAC” to 65075, then share it with your new provider to transfer your number.
- Service Interruption: Minimal, often a few hours at most when porting your number.
SIM Card Sizes
Most networks offer a trio SIM (standard, micro, and nano sizes in one card). Newer phones typically use a nano SIM.
