Secret Codes

To view IMEI (International Mobile Equipment Identity) number enter *#06#
(displays IMEI on 8700, But NOT on 6200, 7500, 8200)

RBS
Activate RBS

(Note: pause means the * key held in until box appears)

To activate RBS type: [pause] [pause] [pause] 1 1 3 [pause] 1 [pause] [ok]

You now have to press the [MENU] and scroll to the 'Eng Field Options' function with the keys, and enable it.

De-activate RBS

To de-activate RBS type: [pause] [pause] [pause] 1 1 3 [pause] 0 [pause] [ok]

This only works with some versions of software. Please report to me what versions work and which doesn't.

These countries has been reported working:

d460: IT
6200 Flare: UK (Orange), AU
7500: IT (model: F16 HW: 5.2 SW: 2.1)
8200: ES, AU, NL, BE
8400: IT, NL
8700: AU, IT, SG, DE, ES, ZA

What's the use of RBS:

Get Distance From Base Station - Place a call, when it is answered, press [MENU] until 'Eng Field Option' is displayed, press [OK], select 'Active Cell', press [OK], press [MENU] until 'Time Adv xxx' appears, where xxx is a number. Multiply this number by 550, and the result is the distance from the RBS (Radio Base Station), in meters.

Get Signal Quality - press [MENU] until 'Eng Field Option' is displayed, press [OK], select 'Active Cell', press [OK], press [MENU] until 'C1' appears. This is the signal quality. If it becomes negative for longer than 5 seconds, a new cell is selected.

Pin Outs
Motorola 5200, 7200, 7500 Pin-Out
Numbered right to left, keypad up, battery down looking

1) Gnd
2) Pos
3) True data (TD) (input)
4) Complimentary data (CD) (input)
5) Return data (RD) (output)
6) Audio gnd
7) Audio out
8) Audio in

Motorola 6200, 8200, 8400 Pin-Out
Numbered left to right, keypad up, battery down

1) Audio Ground
2) V+
3) True data (TD) (input)
4) Downlink - Complimentary data (CD) (input)
5) Uplink - Return data (RD) (output)
6) GND
7) Audio Out - on/off
8) Audio In
9) Manual Test - ???
10) Battery Feedback
11) Antenna connector

Tip & Tricks
Motorola CD 160 Tip.

Press menu and type one of these numbers and press OK:
11 = Status Review
13 = Available Networks
14 = Preferred Networks
22 = Select Keypad Tones
25 = Require SIM Card PIN
26 = Language Selection
32 = Repetitive Timer
33 = Single Alert Timer
34 = Set IN-Call Display
35 = Show Call Timers
36 = Show Call Charges
37 = Call Charge Settings
38 = Reset All Timers
43 = Reset All Timers
45 = Show Last Call
46 = Total For All Calls
47 = Lifetime Timer
51 = Change Unlock Code
52 = Master Reset
53 = Master Clear (Warning!! May result in deleting the Message Editor!!!)
54 = New Security Code
55 = Automatic Lock
63 = Battery Saving Mode

Free call tip
1 Enter the phone number
2 Enter OK
3 Type *#06#
4 Press Button C
4 And finally press the button for power off.
You should now be able to talk without being billed.

Tips and Tricks UPDATED / NEW
Motorola 920/930:

The 54# Tip:
Type 1#, 2#........54# on the keypad (when you're not in the menu) to get the phone number used for
with this key when speed dialing.