Alternate Line service is a
GSM feature for supporting two different phone numbers for voice service on the same mobile device.
The Alternate Line Service (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)and orange also in AT.
This service does not work currently with
Android
Android may refer to:
Science and technology
* Android (robot), a humanoid robot or synthetic organism designed to imitate a human
* Android (operating system), Google's mobile operating system
** Bugdroid, a Google mascot sometimes referred to ...
devices.
Support to date
* Supported by many, but not all, GSM mobile devices.
* Some, but not all, mobile devices support different
ring tone
A ringtone, ring tone or ring is the sound made by a telephone to indicate an incoming call. Originally referring to and made by the electromechanical striking of bells, the term now refers to any sound on any device alerting of a new incoming ...
s for different lines.
* Supported by many, but not all, GSM service providers.
GSM standard
{{Wireless-stub