promotion offer or scam

[Wondering]

I'm on pay as you go £10 big bundle monthly (8GB + unlimited calls & text)...   got a text (supposedly) from O2 offering 16 GB + unlimited calls & text with my next £10 bundle & then 24 GB the following month.  All I need to do is  text 'more' to 2424 (this is not the usual text number for O2?).      Is this a scam ?

[Enlli]

It's a genuine offer 

[MI5]

@Wondering 

The O2 terms from the website:

More data, same price. Ends 7 January.

Close

Get more data for up to 3 consecutive months on the £10, £15, £20 and £30 Rolling Plans, then revert to standard data allowance. Offer will be applied automatically for all first-time customers of Rolling Plan. Existing customers with an eligible Rolling Plan tariff must text “MORE” to 2424 from their O2 Pay As You Go phone to activate the offer by 7 Jan 2026. Your credit balance must be at least the Rolling Plan tariff value on your monthly renewal date for 3 consecutive months to renew Rolling Plan and benefit from the offer for 3 months. If you switch to a non-eligible tariff during the 3 months, you will no longer be part of the promotion and will not get the promotional data allowances once your current Rolling Plan has expired. Data rollover not available on any promotional data. Offer excludes legacy tariffs, including Classic or Standard Pay As You Go. Ends 7 Jan 2026. Any customers who activate their sim before this date will automatically receive the promotion within 72 hours of activation.