Activate TechMode in your phone

2 ways to activate TechMode:
enter *585*0000# in standby mode + Send button
enter *585*0000 in standby mode + Call button
You will see on the screen:
TechMode started
Go to My Shortcuts -> you will see TechMode application.
You can see the TechMode application in Settings->Mobile Networks.
There are 3 screens in TechMode:
- GSM Channel
- GSM AMR
- GSM GPRS
What is techmode?
TechMode screen looks like this:
GSM Channel
A BBB CC -DD EEEEF G
HHHH I JJJ K LL MM
NNN OO PP QQQ RR SSSS
TTT TT UUU UU VVV VV
WWW WW XXX XX ZZZ ZZ
In stanby mode shows only bold marked parameters.
A - current type of service:
B - Broadcast control channel
S - Standalone dedicated control channel
T - Transfer channel
F - Frequency Hopping
BBB - number of current channel:
001...124 - GSM900
512...885 - DCS1800
974...1023 - EGSM900
9999 - no signal
CC - no info, seems like it depends of operator settings
-DD - Rxl (recieve level): -40dBm...-117dBm, -40 is strongest signal
EEEE - Cell ID
F - Cell sector number
G - no info (my phone shows 1 or "---" when phone hopps to other cell. Shows 2 with another SIM. When I switched phone to another operator network 93)HHHH - seems like another channel
I - no info (in my phone almost always 4, possibly fiquency of phone registration at network)
JJJ - no info, range 0...31
K - no info (seems like Timeslot number)
LL - no info (seems like time advance, range 0...34)
MM - no info
NNN - rate of speech codec:
HR - half rate
FR - full rate
EFR - enhanced full rate
OO - no info, range 0...95 (possybly RxQual)
PP - no info, range 0...83
QQQ - network country code (NCC)
RR - operator code (MNC)
SSSS - Location area code
TTT TT, UUU UU, VVV VV, WWW WW, XXX XX, ZZZ ZZ - numbers & Rxl of the best alternative channels
Code *585*0000# tested & working fine on following handsets:
SE K750 - R1CA021
SE К750 - R1DB001
SE K750 - R1BC002
SE K600 - R2BA019
SE D750i - R1BC002
SE W800 - R1BC002