Type of Number in GSM Mobiles This topic has 2 replies, 1 voice, and was last updated 20 years, 9 months ago by Scot. Viewing 3 posts - 1 through 3 (of 3 total) Author Posts 14th March 2004 at 18:03 #37561 carlosGuest I work a for GSM company and I want to know whta are the type of number used by each mobile phone provider por GSM. I know that Nokia and motorola use UNK, Sonny-Ericsson use ISDN, What about the other? 15th March 2004 at 08:56 #37562 MonicaGuest Ericsson use MSISDN i.e ISDN format Thx 19th March 2004 at 17:53 #37563 ScotGuest ISDN Numbering Plan is used widely in GSM. Rgds Author Posts Viewing 3 posts - 1 through 3 (of 3 total) The forum ‘Telecom Design’ is closed to new topics and replies.