When the user travels beyond the area where 3G service is available, the card kicks down to a lower speed supported by the second-generation system.

Here's the difference: users travel in packs; junkies are always alone.

It enables users to travel at a faster speed than normal.

Rather, he said, "the reverse is true: so-called recreational users travel to our cities to purchase drugs."

As the user travels from one cell to the next, the system hands off the signal so that service is uninterrupted.

If the user travels from one cell to another, the call is automatically rerouted through a different antenna.

Most regular users travel with an extra set fully charged.

British Telecom said the new mobile phones lost connections as users traveled from one area to another.

The user may also travel in this "standing" configuration.

Many laws and regulations require equestrian users to travel either with or against motor vehicle traffic.