[Upgrading, Modifying and Unlocking] Majidjan:
Do you have the CID of your phone ? Here' a list of CID which shows the region of a phone (HTC Desire 600)

x.xx.61.x - Orange UK (United Kingdom)

x.xx.69.x - Orange PL (Poland)

x.xx.73.x - Orange FR (France)

x.xx.75.x - Orange ES (Spain)

x.xx.110.x - T-Mobile UK (United Kingdom)

x.xx.111.x - T-Mobile DE (Germany)

x.xx.113.x - T-Mobile CZ (Czech Republic)

x.xx.161.x - Vodafone UK (United Kingdom)

x.xx.163.x - Vodafone FR (France)

x.xx.165.x - Vodafone IT (Italy)

x.xx.168.x - Vodafone GR (Greece)

x.xx.206.x - O2 UK (United Kingdom)

x.xx.401.x - World Wide English (Europe Unbranded)

x.xx.415.x - Arabic (UAE/Middle East)

x.xx.468.x - Turkey

x.xx.497.x - Morocco

x.xx.498.x - WWE Brightpoint US (United States)

x.xx.531.x - T-Mobile US (United Kingdom)

x.xx.666.x - Bell Canada

x.xx.707.x - Asia WWE (World Wide English)

x.xx.709.x - Asia TW (Taiwan)

x.xx.720.x - Asia India

x.xx.771.x - Hutchison 3G UK (United Kingdom)

x.xx.841.x - Telsra WWE (World Wide English)

x.xx.862.x - Voda-Hutch AU (Australia)

x.xx.901.x - TIM IT (Italy)

x.xx.911.x - SK Telecom (South Korea)

x.xx.1400.x - HTC China

x.xx.1403.x - HTC China CMCC (China Mobile Communications Corporation)

SuperCID 11111111

AirTel-India ????????

Asia-HK-CHT HTC__622

ATT CWS__001

BM BM___001

Bouygues-Telecom BOUYG201

Brightstar-PTB BSTAR502

Brightstar-SPA BSTAR301

Chunghwa-Taiwan CHT__601

CT HTCCN702

CU HTCCN703

DCM DOCOM801

DOPOD DOPOD701

Era T-MOB009

Fastweb-IT FASTW401

GOOGLE GOOGL001

H3G-DAN H3G__F05

H3G-Italy H3G__402

H3G-ROI H3G__003

H3G-SWE H3G__G04

H3G-UK H3G__001

HTC-Asia-SEA HTC__037

HTC-Asia-SEA-WWE HTC__044

HTC-Australia HTC__023

HTC-BE HTC__E41

HTC-Czech HTC__C24

HTC-Denmark HTC__F08

HTC-Dutch HTC__E11

HTC-EastEurope HTC__032

HTC-ELL HTC__N34

HTC-FRA HTC__203

HTC-FRA-Bouygues HTC__247

HTC-GCC HTC__J15

HTC-GER HTC__102

HTC-India HTC__038

HTC-ITA HTC__405

HTC-Nor HTC__Y13

HTC-Norway HTC__H10

HTC-Poland HTC__B25

HTC-PTG HTC__506

HTC-Russia HTC__A07

HTC-Singapore ????????

HTC-SPA HTC__304

HTC-Sweden HTC__G09

HTC-Turkey HTC__M27

HTC-WWE HTC__001

Hutch-Australia HUTCH001

O2-DE O2___102

O2-UK O2___001

Open-Channel HTCCN701

Optus-Australia OPTUS001

ORANGE-AT ORANG113

ORANGE-BE ORANG012

ORANGE-CH-FRA ORANG203

ORANGE-CH-GER ORANG104

ORANGE-ES ORANG309

ORANGE-French ORANG202

ORANGE-PL ORANGB10

ORANGE-PO ORANG008

ORANGE-SK ORANG006

ORANGE-UK ORANG001

Rogers ROGER001

SMC-Voda-HK SMCVD001

StarHub-Singapore ????????

TELEF-Spain TELEF301

Telstra TELST001

TELUS TELUS001

TIM-Italy TIM__401

TMA T-MOB102

TMCZ T-MOB004

TMD T-MOB101

TMH T-MOB007

TMHR T-MOB006

TMMK T-MOBL11

TMNL T-MOB003

TMSK T-MOB008

TMUK T-MOB005

TMUS T-MOB010

TWM-TW HTC__621

VIRGIN-UK VIRGI001

VODA-Africa-South HTC__016

VODA-Australia VODAP021

VODA-Germany VODAP102

VODA-Greece VODAP006

VODA-Ireland VODAP019

VODA-Italy VODAP405

VODA-Mobilkom VODAP120

VODA-Netherland VODAPE17

VODA-New-Zealand VODAP022

VODA-Portugal VODAPD18

VODA-Proximus VODAP024

VODA-SA VODAP026

VODA-SFR VODAP203

VODA-Spain VODAP304

VODA-Swisscom-DE VODAP110

VODA-Swisscom-FR VODAP212

VODA-Swisscom-IT VODAP416

VODA-Swisscom-WWE VODAP015

VODA-TR VODAPM27

VODA-UK VODAP001