SIM-only deals have become one of the most popular ways to save money on mobile bills in the UK. Instead of paying for a phone you may not need, SIM-only plans let you keep your current handset while choosing the data, minutes, and contract length that suits you.
This guide compares the best SIM only deals in the UK right now, focusing on value, coverage, flexibility, and real-world usability rather than confusing marketing claims. It’s aimed at UK users who want a better deal without locking themselves into an expensive contract.
✅ Quick Picks – Best SIM-Only Deals (2025)
| Pick | Best for | |
|---|---|---|
| EE SIM-Only | Coverage & speed | Check deal |
| Budget SIMs via Mobiles.co.uk | Cheapest prices | Check deal |
| Unlimited Data SIM | Heavy data users | Check deal |
What to Look for in a SIM-Only Deal
Before choosing a plan, it helps to understand what actually matters:
- Data allowance: Most users are fine with 10–30GB per month; unlimited is useful for heavy streaming or hotspot use.
- Network coverage: Coverage varies across the UK, especially in rural areas. EE generally performs well nationwide.
- Contract length: 30-day plans offer flexibility; 12-month plans are usually cheaper.
- 5G availability: Increasingly common, but only useful if your phone supports it.
- EU roaming: Not every plan includes it anymore — check carefully.
Looking at these factors makes it much easier to compare deals fairly.
Best SIM-Only Deals in the UK
EE SIM-Only Deals
Best for: coverage, reliability, and fast data
EE is often considered one of the strongest UK networks thanks to its wide coverage and fast average speeds. EE SIM-only plans are a solid choice if you travel around the UK or live outside major cities.
Why choose EE:
- Excellent UK-wide coverage
- Reliable performance for calls and data
- Strong 4G and expanding 5G network
Who should avoid EE:
If budget is your top priority, other providers may offer cheaper introductory prices.
SIM-Only Deals on Mobiles.co.uk
Best for: finding cheaper deals across networks
Mobiles.co.uk acts as a comparison retailer, often offering SIM-only plans on networks like Vodafone, O2, and EE at discounted prices. It’s especially useful if you want to compare options in one place.
Why Mobiles.co.uk is useful:
- Competitive pricing
- Frequent promotions
- Access to multiple networks
Who it’s for:
Users looking for the best value deal, not necessarily a specific network.
👉 View SIM-Only Deals on Mobiles.co.uk
Unlimited Data SIM-Only Deals
Best for: streaming, hotspot use, and heavy data
Unlimited SIM-only plans are ideal if you stream a lot of video, use your phone as a hotspot, or want peace of mind without worrying about data limits.
These plans cost more, but for heavy users they can actually work out cheaper than exceeding limits on capped plans.
Good option if:
- You regularly stream video
- You work remotely using mobile data
- You want zero data anxiety
SIM-Only vs Phone Contracts: Which is Better?
For most people, SIM-only plans are cheaper in the long run.
SIM-only works best if:
- You already own a decent phone
- You want flexibility to switch providers
- You want lower monthly costs
Contracts still make sense if:
- You need a new phone and can’t pay upfront
- You want everything in one monthly payment
Many users now buy phones outright and pair them with SIM-only deals to save money.
Frequently Asked Questions
Is SIM-only cheaper than a contract in the UK?
Yes, in most cases. You are only paying for the service, not for the phone itself.
Can I keep my number when switching SIM-only?
Yes. You can keep your number by requesting a PAC code from your current network.
Is EE good for rural coverage?
EE is often regarded as one of the strongest networks for rural and nationwide coverage.
Do SIM-only deals include 5G?
Many do, but availability depends on your location and device compatibility.
Final Advice
SIM-only deals are a smart choice for UK users who want flexibility and lower monthly costs. The best deal depends on how much data you use and how important network coverage is to you.
If you’re also upgrading your tech setup, you may want to check our guide to the best laptops in the UK for work, study, and everyday use.
Last updated: 2025
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