Hi @Mana - what are you trying to unlock?
All O2 phones are sold unlocked (to a network or carrier).
The 18+ lock is described here: Guide: O2 Age restriction.
Spend caps are discussed here: Guide: Spend caps on O2
Not exactly sure what you are trying to do, a little more detail would be helpful.
Hi @Mana did any of the help given above solve your issue?
→ COVID-19 support - Help and support from O2 during the lockdown
→ Access for You: Registration - Find out how to register for our Access for You service.
→ Just joined the community or thinking of registering? Check out this handy starter guide!
→ Have a query about your account? login to My O2 for help
If you'd like to take part, why not register?