Smart O2 SIM deals made for small business

Discover the freedom and incredible value with Daisy Business SIM Only deals.

O2 Business Mobile SIM 5GB

5GB Data | Unlimited Calls & SMS

Was £13.50 | SAVE £84.00*
£10.00per month
24 month contract | Prices ex. VAT
£10.00 per month, increasing to £11.50 from 1st of April 2027, increasing to £13.00 from 1st of April 2028
More Info Buy Now
MOST POPULAR

O2 Business Mobile SIM 15GB

15GB Data | Unlimited Calls & SMS

Was £17.50 | SAVE £132.00*
£12.00per month
24 month contract | Prices ex. VAT
£12.00 per month, increasing to £13.50 from 1st of April 2027, increasing to £15.00 from 1st of April 2028
More Info Buy Now

O2 Business Mobile SIM 25GB

25GB Data | Unlimited Calls & SMS

25GB
Was £20.00 | SAVE £156.00*
£13.50per month
24 month contract | Prices ex. VAT
£13.50 per month, increasing to £15.00 from 1st of April 2027, increasing to £16.50 from 1st of April 2028
More Info Buy Now

New customers paying by Direct Debit only. Inclusive minutes do not include calls to Lyca, Lebara or any mobile virtual network operator based outside the UK GSM cellular networks. Saving values calculated against Daisy RRP pricing. All prices exclude VAT at 20%. Additional contract terms are available please call 03300 534 125 for details.

Need more data? Pick from our biggest data plans

Our top SIM deals with serious data – built for business without boundaries.

O2 Business Mobile SIM 50GB

50GB Data | Unlimited Calls & SMS

Was £25.00 | SAVE £192.00*
£17.00per month
24 month contract | Prices ex. VAT
£17.00 per month, increasing to £18.65 from 1st of April 2027, increasing to £20.30 from 1st of April 2028
More Info Buy Now

O2 Business Mobile SIM 125GB

125GB Data | Unlimited Calls & SMS

Was £26.00 | SAVE £144.00*
£20.00per month
24 month contract | Prices ex. VAT
£20.00 per month, increasing to £21.72 from 1st of April 2027, increasing to £23.44 from 1st of April 2028
More Info Buy Now
BEST VALUE

O2 Business Mobile SIM ∞

Unlimited Data | Unlimited Calls & SMS

Was £23.00 | SAVE £120.00*
£18.00per month
24 month contract | Prices ex. VAT
£18.00 per month, increasing to £19.52 from 1st of April 2027, increasing to £21.04 from 1st of April 2028
More Info Buy Now

New customers paying by Direct Debit only. Inclusive minutes do not include calls to Lyca, Lebara or any mobile virtual network operator based outside the UK GSM cellular networks. Saving values calculated against Daisy RRP pricing. All prices exclude VAT at 20%. Additional contract terms are available please call 03300 534 125 for details.

Compare Our Business SIM Only Deals

5GB SIM

15GB SIM

Unlimited SIM
Monthly cost
 £10.00per month £12.00per month £23.00per month
Data allowance
 5GB 15GB Unlimited
UK calls
 Unlimited Unlimited Unlimited
UK SMS
 Unlimited Unlimited Unlimited
Free EU roaming
 yes yes yes
Upgrade your plan any time
 yes yes yes
Set spending cap
 yes yes yes
Buy Now Buy Now Buy Now

Why Daisy for Mobile

We’re the UK’s largest independent provider of business mobile solutions — offering SIM Only plans designed specifically for small businesses.

Reliable O2 network coverage, flexible data plans, and pricing built to keep your business connected and in control.

Coverage

Powered by O2, our SIMs deliver excellent 4G coverage across the UK, with growing 5G reach — so your team stays connected wherever they work.

Extras

Access O2 Priority rewards, early ticket sales, exclusive offers, and free Wi-Fi at thousands of UK locations — perfect for working on the move.

Control

Manage your mobiles with My Account — view invoices, track usage, set spend caps, and avoid bill shocks with one simple dashboard.

Support

Friendly, UK-based customer service is always here to help your business stay connected and productive.

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