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O2 24-month SIM only deals

O2 24-month SIM only deals give you a good discount for committing to a longer contract and already have a phone. Other detals include:

O2 30-day SIM only dealsO2 12-month SIM only dealsO2 unlimited data SIMsCheapest O2 SIM only dealsO2 Mobile Broadband SIM onlyO2 Tablet SIM onlyO2 5G SIMs
Our top pick
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Unlimited speed
5G+

SIM Only Classic

Data
100 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £576
Price
£24per month
  • Price becomes £26.50 on 1 April 2026
  • Price becomes £29 on 1 April 2027
Choose 3 months of Disney+ Standard, Amazon Prime, or more. (3 months)
Get deal
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Unlimited speed
5G+

SIM Only Classic

Data
50 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £552
Price
£23per month
  • Price becomes £25.50 on 1 April 2026
  • Price becomes £28 on 1 April 2027
Get deal

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Unlimited speed
5G+

SIM Only Plus 10GB

Data
10 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £431.76
Price
£17.99per month
  • Price becomes £20.49 on 1 April 2026
  • Price becomes £22.99 on 1 April 2027
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Unlimited speed
5G+

SIM Only Classic

Data
20 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £480
Price
£20per month
  • Price becomes £22.50 on 1 April 2026
  • Price becomes £25 on 1 April 2027
Get deal
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Unlimited speed
5G+

SIM Only Classic

Data
250 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £648
Price
£27per month
  • Price becomes £29.50 on 1 April 2026
  • Price becomes £32 on 1 April 2027
Get deal
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Unlimited speed
5G+

SIM Only Plus 40GB

Data
40 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £527.76
Price
£21.99per month
  • Price becomes £24.49 on 1 April 2026
  • Price becomes £26.99 on 1 April 2027
Get deal
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Unlimited speed
5G+

SIM Only Classic

Data
3 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £384
Price
£16per month
  • Price becomes £18.50 on 1 April 2026
  • Price becomes £21 on 1 April 2027
Get deal
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Unlimited speed
5G+

SIM Only Ultimate 150GB

Data
150 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £659.76
Price
£27.49per month
  • Price becomes £29.99 on 1 April 2026
  • Price becomes £32.49 on 1 April 2027
Get deal
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Unlimited speed
5G+

SIM Only Ultimate 40GB

Data
40 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £731.76
Price
£30.49per month
  • Price becomes £32.99 on 1 April 2026
  • Price becomes £35.49 on 1 April 2027
Get deal
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Unlimited speed
5G+

SIM Only Ultimate 10GB

Data
10 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £635.76
Price
£26.49per month
  • Price becomes £28.99 on 1 April 2026
  • Price becomes £31.49 on 1 April 2027
Get deal
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Unlimited speed
5G+

SIM Only Classic

Data
30 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £360
Price
£15per month
  • Price becomes £17.50 on 1 April 2026
  • Price becomes £20 on 1 April 2027
Get deal

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