*#06# for checking the IMEI (International Mobile Equipment Identity)
*#0000# shows the SW version.
*#92702689# to enter service menu.

Latest software version 5.22 (10-11-99) NSM-1

Older versions:
5.20 (20-09-99) NSM-1
5.17 (01-07-99) NSM-1

Updates:
1. Updated GSM-list
2. *4720# and #4720# (activate/deactivate Halfrate) doesn't work anymore!
3. New menu option: 4-4-6 Confirm SIM service actions Lets you select whether SIM service actions are visible and confirmed by you.
4. Automatic menu-language selection doesn't work anymore!

V 5.02 (02-02-99) NSM-1
V 4.13 NSM-1 (EFR option should be back in this version)
V 4.12 NSM-1 (EFR option removed in this version)
V 4.11 NSM-1 (EFR option removed in this version)
V 4.02 NSM-1