New PAYG SIM - How quickly do i need to activate ?

Okay @Nic Rawlings, iD supply activated SIM cards for any new connection to their network. 

At iD Mobile they will disconnect a PAYG SIM from their network after ~4-months of no chargeable service (see sections 7 and 12 of the PAYG terms). 

Thanks @andewhite for your swift reply. 
So, to be clear : IDmobile PAYG sims arrive active? Therefore, if I leave the SIM in the delivery envelope, I will be wasting ( say £9 for 36GB ) the original outlay? 
if then, after 60 days, I choose to use the SIM, I can pop in the phone, add credit and off to go ? 
thanks for your help … 

Awaiting clarity from IDMobile representative. 

Hi @Nic Rawlings 

iD Mobile SIM cards ordered online will be activated upon dispatch.

If you’d like to ‘control’ the date a plan/SIM is active from, you’ll be able to purchase in a store and it’d be active from that date.

Tom

Thanks, @Tom for confirming. It’s not the solution I was after, unfortunately. I wanted full control, online. 
cheers. 

Hi @Nic Rawlings 

No worries, let us know if you need anything else.

Tom