it means that the carrier signal is too low so the signal is "unavalible"
the network is too busy or some maintenace is being done at that time
It means that the phone is switched off.
You may have to lower internet security settings and firewall settings to run MapleStory.
It either means they are out of the service area, or they do not have voicemail is what Telus told me.... their # still is on but they have the phone off
It means that when you are buying a phone, e.g: from a phone shop which is not a network like o2 or Tesco or orange. It will not have the network company's logo like 3 mobiles, they have the 3 logo behind. So no network logo means no logo of a network behind the mobile like 3!
The grapevine is a network of people who pass around gossip. The grapevine is seen in businesses and social settings.
there phone is busy.or there is some network problem
It means the person is unavailable. HA! Most likely the phone is in an area which can get n service and the person has not set up voicemail or does not have voicemail on the phone.
It means that the network is down.
It means that the place where you are with your phone does not get strong signal from your carrier.
from my experience with this, it usually means they didnt pay their bill, especially if its a prepaid account
It depends on the context. Someone may be unavailable because they are away for some reason. A service may be unavailable due to technical difficulties. An item may be unavailable because it is out of stock.