Bolt on

[Hm21]

I have purchased a bolt on to use in Thailand but won’t work 

[pgn]

What bolt-on?

https://www.o2.co.uk/international/using-your-phone-abroad

If you are Contract, O2 Travel Bolt-On is your £6 per day option: 

https://www.o2.co.uk/international/o2-travel

If PAYG, you would fare better buying a local PAYG SIM and using WhatsApp or similar, @Hm21 

Guide: Roaming MegaGuide 

Good luck!

[Hm21]

I got the  the one via 02 the one that said Thailand zone 2

[pgn]

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@Hm21 wrote:

I got the  the one via 02 the one that said Thailand zone 2

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By any chance, @Hm21, is your phone contract an O2 Business Contract, possibly from a reseller?

I ask because the Business side of O2 uses the "zone" concept for bolt-ons, and Thailand is definitely in their Zone 6: Rest of World:

https://www.o2.co.uk/business/solutions/mobile/international/call-and-data-costs-while-abroad