Find my iPhone without wifi or data question
I'm aware that if you put an iPhone in lost mode when the iPhone is not connected to the internet, it will not be put into lost mode or be trackable until it is connected to the internet again, but what if it is connected to my network (EE), bearing in mind that a data pack/addon is not turned on, what if I buy data for it while it's lost and in lost mode (so buying say a £1 addon from EE), would it then connect to the internet and be locatable then?
To put simply:
iPhone is lost with no wifi connections, but has a signal to EE,
I am at home and visit EE on my laptop to buy a data pack for the phone, thus giving it internet,
I then visit icloud.com and turn on Lost Mode, now that my phone has internet, I should then be able to locate it?
Even if I am right and this is possible, I think FMiP would work better without having to rely on an internet connection, and just be trackable via a phone signal connection. But then I suppose Apple wouldn't be allowed/have access to something only accessible through a phone network(?)
iPhone 6s, iOS 10.3.1