I think it means that you're in an restricted area where the phone can not pick up signals for incoming and outgoing phone calls.
my phone say no line
prohibited
searching for service or out of range
yes
A land-line phone number is just a house phone. you know.. the kind that you don't carry around with you when you go places.
you change the battery
It means that the phone is switched off.
you need to charge it
Probably
They are out of service
He wants to plow you
It's Tongue Tied by GROUPLOVE
the network is too busy or some maintenace is being done at that time