repost from other thread:
mobile networks can close their networks & restart in a mode which allows use by specified user groups only (eg doctors, govt officials, emergency services etc). Ordinary users would be unable to use the service. This sounds like what you mean by comandeered.
UK has closed airports til further notice, aircraft en route have been called back to UK, City square mile, canary wharf, Houses of Parliament etc are evacuating. Stock exchange closed early. There are rumours of the tubes being closed (unconfirmed).
All is very confused and worrying for all. Very worried for everyone everywhere.
There are reports of one or maybe two planes still unaccounted for - but these could be due to general confusion.
Kris