Best Data SIMs for Routers & Portable WiFi in the UK (2026 Guide) | eFones
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Mobile data SIM cards are essential for getting internet on your home WiFi router, portable WiFi hotspot or mobile broadband device. Whether you need a data-only SIM for a router, a SIM for travel, or a no-contract plan for everyday use, this guide will help you choose the right option in the UK for 2026.
This buyer’s guide compares the best data SIMs available at eFones — from small data packs for occasional use to generous allowances for home internet.
What to Look for in a Data SIM
When selecting a data SIM, focus on these key factors:
- Data allowance: More data means more browsing, streaming and downloads.
- Network coverage: Check the provider’s UK coverage map.
- Pay-as-you-go vs no contract: Flexibility vs long-term savings.
- Validity period: How long the data lasts before expiry.
- Device compatibility: Ensure it works with your router or hotspot.
Data SIMs vs Phone SIMs
Data SIMs are optimised for internet use — they usually offer better data allowances and are perfect for routers and hotspots. Phone SIMs can include data too, but may include voice and text features that aren’t needed for internet-only devices.
Best Data SIMs for WiFi Routers & Hotspots
📶 Flexible No Contract SIM – SMARTY SIM Card
An excellent choice if you want total flexibility. This SIM can be used in phones, routers or hotspots and works on a no-contract basis.
- Unlimited data options available
- No contract — cancel anytime
- Works in phones, routers and hotspots
- Great for flexible home and travel use
📦 Best Entry Data SIM – Three Mobile Broadband 1GB Data SIM
Great for occasional internet use or testing your router or hotspot coverage before committing to a bigger plan.
- 1GB data — ideal for light browsing & testing
- 30-day validity
- Works well in routers & portable hotspots
View Three 1GB Mobile Broadband Data SIM
📶 Balanced Data SIM – Three Mobile Broadband 3GB Data SIM
A balanced choice for portable use or less demanding home internet needs.
- 3GB data — good for light video, browsing & email
- 30-day validity
- Ideal for short trips or temporary setups
View Three 3GB Mobile Broadband Data SIM
📱 Best Larger Data SIM – Three Mobile Broadband 24GB Data SIM
Perfect for heavier portable use, longer trips, or frequent web browsing and streaming.
- 24GB data — great for YouTube, streaming and families
- 30-day validity
- Ideal for routers or hotspots with multiple users
View Three 24GB Mobile Broadband Data SIM
Voice & Data SIM Packs (Good All-Rounders)
These SIMs include both voice and data, making them a versatile option if you want the best of mobile connectivity and internet.
📞 Basic PAYG Voice SIM Pack
A simple and affordable SIM pack that includes voice, texts and basic data — great for everyday phone use with some internet.
- Voice + text + data included
- Pay-as-you-go flexibility
- Useful if you want one SIM for calls and internet
View Three PAYG Voice SIM Pack
📶 Voice + 10GB Data SIM Pack
A good all-rounder with a healthy data allowance for everyday use.
- 10GB data plus voice and text
- 30-day validity
- Great balance for phones and light hotspot use
View Three PAYG Voice SIM Pack – 10GB
🌐 Voice + 60GB Data SIM Pack
A larger data bundle with voice and text — ideal for heavier internet users with phones or hotspots.
- 60GB data over 30 days
- Voice + text included
- Excellent choice for routers or hotspot sharing
View Three PAYG Voice SIM Pack – 60GB
Which SIM Should You Choose?
If you’re pairing a SIM with a home router or portable WiFi hotspot, focus on the data-only SIMs with larger allowances (like 24GB) or flexible options like the SMARTY SIM. If you want a single SIM for phone calls + data, the voice & data packs are strong all-round choices.
Browse SIM Cards at eFones
At eFones, we stock a wide range of SIMs for broadband, phones and travel — all with fast UK delivery and flexible usage options.
Browse All SIM Cards | Shop Smartphones
Frequently Asked Questions
Do I need a SIM for my router or hotspot?
Yes — to get internet on a 4G/5G router or portable hotspot, you’ll need a mobile data SIM with a plan that includes enough data.
Can I use a phone SIM in a router?
Yes — many phone SIMs work in routers and hotspots, but check the network compatibility and data allowances before you buy.
What is the difference between data-only and voice SIMs?
Data-only SIMs are tailored for internet use and usually offer larger allowances. Voice SIMs include phone calls and texts as well as data.
How do I check coverage for my SIM?
Check the provider’s UK coverage maps (Three, SMARTY, etc.) before choosing your SIM to ensure strong signal in your area.
Can I switch SIMs between devices?
Yes — most SIMs can be moved between compatible phones, routers and hotspots as needed.