Samsung SGH-R220 - Manual (Page 67)

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Glossary
To help you understand the main technical terms and
abbreviations used in this booklet and take full
advantage of the features on your mobile phone, here
are a few definitions.
ALS (Alternate Line Service)
Capability of associating two alternate lines with one
SIM card. You can make and receive calls on either
line as required.
Call Barring
Ability to restrict outgoing and incoming calls.
Call Diverting
Ability to reroute calls to another number.
Call Holding
Ability to put one call on standby while answering or
making another call; you can then switch between
the two calls, as required.
Call Waiting
Ability to inform users that they have an incoming call
when engaged on another call.