Additional SIM?

[JWD]

I'm looking at purchasing a power monitor that can send SMS alerts. I'm an existing pay monthly customer, so just need to add another SIM to my account for the power monitor. No data needed. In myO2, I cannot see an option to add a SIM, nor when in the O2 shop, can I see how I might link the SIM to my existing account. I don't want two seperate logins for myO2! Is this achieveable?? 

[MI5 · Accepted solution]

@JWD 

Your best option would be to order the £5 PAYG sim https://www.o2.co.uk/shop/sim-cards/pay-as-you-go

Once you have it and register it for a MyO2 account, you can combine it with your current one if it's not done automatically.