Alternate line service

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Alternate Line service is a GSM feature for supporting two different phone numbers for voice service on the same mobile device.[1]

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.[citation needed] 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.[2]

As of 2010, this service does not work currently with Android devices.[2]

Support to date

[edit]
  • Supported by many, but not all, GSM mobile devices.
  • Some, but not all, mobile devices support different ring tones for different lines.
  • Supported by many, but not all, GSM service providers.

References

[edit]
  1. ^ GSM MOBILE STATION & FIXED CELLULAR TERMINAL GENERIC REQUIREMENTS (PDF) (March 2004 ed.). India: Telecommunications Engineering Centre. p. 11. Retrieved 31 October 2025.
  2. ^ a b "Google Issue Tracker". issuetracker.google.com. Retrieved 2025-10-31.
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