179GlossaryTo help you understand the main technical termsand abbreviations used in this booklet and take fulladvantage of the features of your mobile phone,here are a few definitions.ALS (Alternate Line Service)Capability of associating two lines with one SIMcard. With this service, you can make and receivecalls on either line, as required.Call barringAbility to restrict outgoing and incoming calls.Call divertingAbility to reroute calls to another number.Call holdingAbility to put one call on standby while answering ormaking another call; you can then switch betweenthe two calls, as required.Call waitingAbility to inform users that they have an incomingcall when engaged on another call.CLI (Caller Line Identification) servicesServices allowing subscribers to view or block thetelephone numbers of callers.
