Alternate line service

Alternate line service

Alternate Line service is a GSM feature for supporting two different phone numbers on the same mobile device.

The AlternateLineService (ALS) was introduced as additional service with the former "PCS-1800" (now better known as GSM1800) standard, in a specification called "CPHS". This is the reason that GSM900 singleband phones do not support this feature, while the corresponding GSM1800 version often does (e.g. Ericsson GH-337 vs. PH-337). Later it became part of the GSM-Specs and was adapted even by some traditional GSM900 providers, e.g. A1(AT).

upport to date

* Supported by many, but not all, GSM mobile devices.
* Some, but not all, mobile devices support different ring tones for different lines.
* Supported by few, but not all, GSM service providers.

Links

* [http://www.sunday.com/portal/common/plaintext.jsp?fldr_id=187 SUNDAY] {Mandarin Communications Ltd)
* [http://www.unlockme.co.uk/linetwo.html UnlockMe.co.uk] (Orange)


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