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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 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
Free Disney+, Amazon Music, Prime, Audible, Cafeyn or McAfee Subscription (6 months)
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Unlimited speed
5G+

SIM Only Classic

Data
Unlimited
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £768
Price
£32per month
  • Price becomes £34.50 on 1 April 2026
  • Price becomes £37 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
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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
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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
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Unlimited speed
5G+

SIM Only Plus 150GB

Data
150 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £623.76
Price
£25.99per month
  • Price becomes £28.49 on 1 April 2026
  • Price becomes £30.99 on 1 April 2027
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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
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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
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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: £456
Price
£19per month
  • Price becomes £21.50 on 1 April 2026
  • Price becomes £24 on 1 April 2027
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Unlimited speed
5G+

SIM Only Plus Unlimited

Data
Unlimited
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £551.76
Price
£22.99per month
  • Price becomes £25.49 on 1 April 2026
  • Price becomes £27.99 on 1 April 2027
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logo
Unlimited speed
5G+

SIM Only Classic

Data
40 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
24 months
Total cost: £408
Price
£17per month
  • Price becomes £19.50 on 1 April 2026
  • Price becomes £22 on 1 April 2027
Get deal

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