How to activate lost mode on iCloud for iPhone that cannot be located? I lost my phone in a taxi just after landing at an airport. My phone was in airplane mode and I cannot locate it with iCloud. On iCloud help pages, it says I can turn on the lost mode.

I tried:


Locate my phone, wait for it to fail. No menu appeared to ask if I wanted to lock it
Go in Settings -> my iPhone. I clicked on "lost your phone ? ...? " which did nothing but bring me to a help page


Is that normal ? I'm using Ubuntu/Chrome if it can help.
Login to iCloud, go to Find My iPhone, select your phone in the drop down list on the top of the page, provided it has Find My iPhone enabled it should show up as offline. Lost mode should be available.