SIM Only Deals UK: Compare The Best SIM Only Plans In 2026
SIM-only deals continue to be one of the most popular ways to save money on mobile bills across the UK.
Instead of paying for a new handset through a mobile contract, SIM-only plans provide calls, texts and data while allowing you to keep your existing phone.
For many consumers, SIM-only contracts offer greater flexibility, lower monthly costs and access to competitive data allowances, including unlimited data plans.
This guide explains how SIM-only deals work, the different contract options available and how to compare SIM-only plans to find the right package.
Compare SIM Only Deals Now
Start Mobile Comparison →What Is A SIM Only Deal?
A SIM-only deal is a mobile phone contract that includes:
- Calls
- Text Messages
- Mobile Data
Unlike traditional mobile phone contracts, SIM-only plans do not include a handset.
Customers simply insert the SIM card into their existing phone and start using the service.
Why Choose A SIM Only Deal?
SIM-only contracts offer several benefits.
Lower Monthly Costs
Because there is no handset included, SIM-only plans are usually cheaper than traditional phone contracts.
Greater Flexibility
Many providers offer:
- 30-Day Rolling Contracts
- 12-Month Contracts
- 24-Month Contracts
This gives customers more flexibility when choosing a plan.
Keep Your Existing Phone
Many people are happy with their current handset and do not need to upgrade every year.
Larger Data Allowances
SIM-only deals often provide more data for the monthly cost compared to handset contracts.
Types Of SIM Only Deals
Rolling Monthly SIM Deals
Rolling contracts typically operate on a 30-day basis. Benefits include:
- Flexibility
- No long-term commitment
- Easy switching
12-Month SIM Contracts
These plans often provide lower monthly pricing compared to rolling contracts. Suitable for:
- Regular users
- Budget-conscious customers
24-Month SIM Contracts
Longer agreements may offer additional value and promotional pricing.
Unlimited Data SIM Deals
Unlimited plans allow customers to:
- Stream video content
- Use social media
- Browse extensively
- Work remotely
- Play online games
Without worrying about data limits.
Compare SIM Only Data Allowances
Choosing the right data allowance is important.
| Data Allowance | Suitable For |
|---|---|
| 5GB | Light Users |
| 10GB | Social Media Users |
| 20GB | Regular Browsing |
| 50GB | Streaming & Video Calls |
| 100GB | Heavy Usage |
| Unlimited | Power Users |
Compare Leading UK Mobile Networks
Popular UK mobile networks include:
- EE
- O2
- Vodafone
- Three
Many additional providers use these major network infrastructures.
SIM Only Network Comparison
| Network | 4G | 5G | Unlimited Data | Rolling Contracts |
|---|---|---|---|---|
| EE | ✓ | ✓ | ✓ | Available |
| O2 | ✓ | ✓ | ✓ | Available |
| Vodafone | ✓ | ✓ | ✓ | Available |
| Three | ✓ | ✓ | ✓ | Available |
SIM Only Vs Mobile Phone Contracts
Understanding the difference can help you choose the right option.
| Feature | SIM Only | Phone Contract |
|---|---|---|
| Includes Phone | No | Yes |
| Lower Monthly Cost | Usually | No |
| Flexible Options | Yes | Limited |
| Upgrade Required | No | Usually Included |
| Unlimited Data Available | Yes | Yes |
SIM-only plans are often suitable for people who already own a handset.
Best SIM Only Deals For Different Users
Light Mobile Users
Suitable options: 5GB Data, 10GB Data. Ideal for calls, texts, basic browsing.
Average Users
Suitable options: 20GB Data, 50GB Data. Ideal for social media, streaming, video calls.
Heavy Data Users
Suitable options: 100GB Data, Unlimited Data. Ideal for remote working, gaming, HD streaming.
5G SIM Only Deals
Many SIM-only contracts now include access to 5G networks. Benefits include:
- Faster downloads
- Improved streaming
- Lower latency
- Better performance in supported areas
5G availability depends on coverage and device compatibility.
How To Switch To A SIM Only Deal
Step 1 — Choose a SIM-only plan.
Step 2 — Check network coverage.
Step 3 — Request a PAC code if you want to keep your number.
Step 4 — Activate your new SIM.
Step 5 — Transfer your number if required.
Most UK customers can keep their existing number when switching providers.
SIM Only Deals By Location
Coverage and performance can vary by area. Popular searches include:
- SIM Only Deals London
- SIM Only Deals Birmingham
- SIM Only Deals Manchester
- SIM Only Deals Leeds
- SIM Only Deals Liverpool
- SIM Only Deals Glasgow
- SIM Only Deals Cardiff
These sections strengthen GEO and local search visibility.
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Instead of visiting multiple mobile providers individually, CheckMyBills lets you compare mobile phone deals, SIM-only plans and contract phones in one place.
Compare SIM Only Deals In 60 Seconds
With CheckMyBills you can:
- Compare SIM-only deals
- Compare unlimited data plans
- Review multiple networks
- Compare monthly costs
- Compare data allowances
- No login required
- Instant comparisons
Finding a suitable SIM-only deal takes just a few minutes.
A SIM-only deal provides calls, texts and data without including a handset.
Conclusion
SIM-only deals remain one of the most cost-effective ways to access mobile services in the UK.
Whether you're looking for a cheap SIM-only contract, an unlimited data plan or a flexible rolling agreement, comparing providers can help you find the right package for your needs.
With CheckMyBills, you can compare SIM-only deals in around 60 seconds, review multiple networks, compare data allowances and find suitable plans with no login required.