Unlimited data SIM only deals
Stream, browse and download as much as you want. Compare unlimited data SIM only deals.
Prices correct as of August 2026. We may earn commission when you click through — this never affects our rankings.
8 deals availableUpdated daily
Showing 8 deals
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iD Mobile
4.3 (70000)
Uses Three network
No price riseData rollover5G
Data
Unlimited
Calls
Unlimited
Texts
Unlimited
Contract
SIM only
£15.00/mo
✓ Roll over unused data✓ No roaming charges in EU✓ No price rises mid-contract
SM
Smarty
4.0 (48000)
Uses Three network
No price riseData refund
Data
Unlimited
Calls
Unlimited
Texts
Unlimited
Contract
SIM only
£17.00/mo
✓ No annual price rises✓ Unused data refunded✓ EU roaming included✓ No Credit Checks, Data Roaming
giffgaff
3.9 (30000)
Uses O2 network
No price riseEU roaming
Data
Unlimited
Calls
Unlimited
Texts
Unlimited
Contract
SIM only
£20.00/mo
✓ No contract✓ EU roaming included✓ Free SIM delivery
AM
Asda Mobile
3.7 (17000)
Uses Vodafone network
No contractNo price rise5G
Data
Unlimited
Calls
Unlimited
Texts
Unlimited
Contract
SIM only
£22.00/mo
✓ No contract✓ Free SIM✓ Rewards with Asda shopping
LB
Lebara
4.8 (78000)
Uses Vodafone network
EU roamingInternational calls
Data
Unlimited
Calls
Unlimited
Texts
Unlimited
Contract
SIM only
£25.00/mo
✓ International minutes included✓ EU roaming included✓ No credit check
MZ
Mozillion
Uses multiple networks
Flexible plans
Data
Unlimited
Calls
Unlimited
Texts
Unlimited
Contract
SIM only
£25.00/mo
✓ Flexible plans✓ No long contracts
VOXI
3.2 (23000)
Uses Vodafone network
No price rise5G ready
Data
Unlimited
Calls
Unlimited
Texts
Unlimited
Contract
SIM only
£30.00/mo
✓ Endless social media✓ Endless video streaming✓ 5G at no extra cost
O2
O2 network
O2 PriorityEU roaming
Data
Unlimited
Calls
Unlimited
Texts
Unlimited
Contract
SIM only
£35.00/mo
✓ O2 Priority rewards✓ EU roaming included✓ 5G at no extra cost