[Xperia Play Themes and Apps] ozzmanj1:
OK, this is going to be very long but here is why, every code for Market Enabler. All it took was a simple Google search of "List of Market Enabler Codes", then the very first result was this:

And as such I take no credit for this as I am merely copying and pasting. I used this same list to add in Docomo from Japan in Market Enabler and it worked.

******Original Link: http://xdaforums.com/showthread.php?t=797625

20210 Telestet Greece

20404 Vodafone Netherlands

20408 KPN Netherlands

20412 Telfort Netherlands

20416 T-Mobile Netherlands

20420 Orange Netherlands

20601 Proximus Belgium

20610 Mobistar Belgium

20620 Base Belgium

20801 Orange France

20810 SFR France

20820 Bouygtel Telecom France

21303 S.T.A. MobilAnd Andorra

21401 Vodafone Spain

21402 Movistar Spain

21403 Amena Spain

21404 Xfera Spain

21407 Telefonica Movistar Spain

21601 Pannon GSM Hungary

21630 Westel 900 GSM Mobile Hungary

21670 Vodafone Hungary

21803 Eronet Bosnia Herzegovina

21805 Mobi's Bosnia Herzegovina

21890 GSM BIH Bosnia Herzegovina

21901 Croatian Telecoms Cronet Croatia

21910 VIP Croatia

22001 MOBTEL Yugoslavia

22002 ProMonte GSM Yugoslavia

22003 03 Yugoslavia

22004 Monet Yugoslavia

22201 Telecom Italia Mobile TIM Italy

22210 Vodafone Italy

22288 Wind Telecomunicazioni Italy

22298 BLU Italy

22299 3 Italy

22601 MobiFon CONNEX GSM Romania

22603 Cosmorom Romania

22610 Mobil Rom DIALOG Romania

22801 Swisscom NATEL Switzerland

22802 Sunrise Switzerland

22803 Orange Switzerland

23001 T-mobile Czech Republic

23002 EuroTel Praha Czech Republic

23003 Oskar Czech Republic

23101 Orange GSM Slovak Republic

23102 EuroTel GSM Slovak Republic

23201 MobilKom Austria A1 Austria

23203 T-Mobile Austria

23205 Connect Austria One Austria

23207 Tele.ring Austria

23210 3AT Austria

23400001 Virgin United Kingdom (3510i & N-Gage, IMEI 351xxx..)

23410 02 United Kingdom

23415 Vodafone United Kingdom

23420 3 United Kingdom

23430 Virgin United Kigndom (others)

23430 T-Mobile United Kingdom

23433 Orange United Kingdom

23450 Jersey Telecom GSM United Kingdom

23455 Guernsey Telecoms GSM United Kingdom

23458 Manx Telecom Pronto GSM United Kingdom

23800001 Debitel Denmark

23801 Tele-Danmark Mobil Denmark

23802 Sonofon Denmark

23820 Telia Denmark Denmark

23830 Orange Denmark

24001 Telia Mobitel Sweden

24002 3 Sweden

24003 Orange Sweden

24007 Comviq GSM Sweden

24008 Vodafone Sweden

24201 Telenor Mobil Norway

24202 NetCom GSM Norway

24403 Telia Finland Finland

24405 Radiolinja Finland

24407 AT&T (3650 with IMEI 351102500xxxxxx) U.S.A.

24409 Finnet Group Finland

24412 2G Finland

24414 AMT Finland

24491 Sonera Corporation Finland

24601 Omnitel Lithuania

24602 UAB Bite GSM Lithuania

24603 Tele 2 Lithuania

24701 Latvian Mobile Tel. Latvia

24702 Tele 2 Latvia

24801 Estonian Mobile Telephone Estonia

24802 RadioLinja Eesti Estonia

24803 Tele 2 Estonia

25001 MTS Moscow Russia

25002 Megafon Russia

25005 Siberian Cellular Russia

25007 Zao Smarts Russia

25010 Don Telecom Russia

25012 New Telephone Company Russia

25013 Kuban GSM Russia

25039 Uratel Russia

25044 North Caucasian GSM Russia

25099 BeeLine Russia

25501 Ukrainian Mobile Comms Ukraine

25502 Ukrainian Radio Systems Ukraine

25503 Kyivstar GSM Ukraine

25505 Golden Telecom Ukraine

25701 Velcom

25702 MTS

25901 Voxtel Moldova

25902 Moldcell Moldova

26001 Polkomtel PLUS GSM Poland

26002 ERA GSM Poland

26003 IDEA Centertel Poland

26201 T-Mobile Germany

26202 Vodafone Germany

26203 E-Plus Mobilfunk Germany

26207 O2 Germany

26213 MobilCom Germany

26214 Quam Germany

26601 Gibraltar Telecoms Gibtel Gibraltar

26801 Vodafone Portugal

26803 Optimus Telecom. Portugal

26806 Telecom Moveis Nac. TMN Portugal

27001 P+T LUXGSM Luxembourg

27077 Millicom Tango GSM Luxembourg

27201 Vodafone Ireland

27202 O2 Ireland

27203 Meteor Ireland

27401 Iceland Telecom Siminn Iceland

27402 TAL hf Iceland

27403 Islandss Iceland

27404 Viking Iceland

27601 Albanian Mobile Comms Albania

27602 Vodafone Albania

27801 Vodafone Malta

27821 Go Mobile Malta

28001 Cyprus Telecoms Authority Cyprus

28201 Geocell Limited Georgia

28202 Magti GSM Georgia

28203 Geo 03 Georgia

28301 ArmenTel Armenia

28401 MobilTel AD Bulgaria

28405 Globul Bulgaria

28601 Turkcell Turkey

28602 TELSIM Turkey

28603 Aria Turkey

28604 Aycell Turkey

28801 FT-GSM

28802 KALL

29001 Tele Greenland Greenland

29340 Si.mobil Slovenia

29341 Si-GSM Slovenia

29370 Si VEGA 070 Slovenia

29401 MobiMak Macedonia

29402 MTS AD Macedonia

29501 Telecom

29502 Montel

29505 FL1

29577 Tango

30200001 Fido Canada

30237 Microcell Connexions Inc Canada

30272 Rogers AT&T Canada

31001 Pacific Mobile Comms Papua New Guinea

31002 APC Sprint Spectrum U.S.A.

31011 Wireless 2000 Telephone U.S.A.

31015 BellSouth Mobility DCS U.S.A.

31017 Cingular (Pacific Bell Wireless) U.S.A.

31020 T-Mobile U.S.A.

31026 Western Wireless Voicestream U.S.A.

31027 Powertel U.S.A.

31031 Aerial Communications U.S.A.

31038 AT&T U.S.A.

31077 Iowa Wireless Services U.S.A.

33805 Digicel JM

34001 Orange French West Indies

34020 BouygTel French West Indies

36801 C-Com CU

37412 TSTT

40001 Acell Telekom B.M. Azerbaijan

40002 BKcell GSM 2000 Azerbaijan

40101 K-Mobile Kazaksthan

40102 KCELL Kazaksthan

40217 B-Mobile BT

40401 Aircel Digilink Essar Cellph. India

40402 Bharti Cellular Telecom Airtel India

40403 Bharti Cellular Telecom Airtel India

40405 Hutch India

40407 TATA Cellular India

40408 Ushafon India

40410 Bharti Cellular Telecom Airtel India

40411 Hutch India

40412 Escotel Mobile Comms India

40413 Hutch India

40414 Ina Spice India

40415 Aircel Digilink Essar Cellph. India

40419 Escotel India

40420 Orange India

40421 BPL USWest Cellular India

40422 Idea India

40423 Usha Martin Tel. Command India

40424 Idea India

40426 Usha Martin Tel. Command India

40427 BPL USWest Cellular India

40430 Usha Martin Tel. Command India

40431 Bharti Cellular Telecom Airtel India

40432 Ushafone India

40434 BPL USWest Cellular India

40438 BPL USWest Cellular India

40440 INA AIRTel India

40441 RPG MAA India

40442 Srinivas Cellcom India

40443 BPL USWest Cellular India

40444 Spice India

40445 Bharti Cellular Telecom Airtel India

40446 BPL USWest Cellular India

40449 Bharti Cellular Telecom Airtel India

40451 BSNL Mobile India

40453 BSNL Mobile India

40454 BSNL Mobile India

40455 BSNL Mobile India

40456 Escotel India

40457 BSNL Mobile India

40458 BSNL Mobile India

40459 BSNL Mobile India

40460 Aircel Digilink Essar Cellph. India

40462 BSNL Mobile India

40464 BSNL Mobile India

40466 BSNL Mobile India

40468 Dolphin India

40469 Dolphin INdia

40470 Oasis India

40471 BSNL Mobile India

40472 BSNL Mobile India

40473 BSNL Mobile India

40474 BSNL Mobile India

40475 BSNL Mobile India

40476 BSNL Mobile India

40477 BSNL Mobile India

40478 IDEA India

40479 BSNL Mobile India

40480 BSNL Mobile India

40481 BSNL Mobile India

40486 Hutch India

40490 Bharti Cellular Telecom Airtel India

40492 Bharti Cellular Telecom Airtel India

40493 Bharti Cellular Telecom Airtel India

40494 Bharti Cellular Telecom Airtel India

40495 Bharti Cellular Telecom Airtel India

40496 Bharti Cellular Telecom Airtel India

40497 Bharti Cellular Telecom Airtel India

40498 Bharti Cellular Telecom Airtel India

41001 Ufone Pakistan

41201 AWCC AF

41302 MTN Networks Dialog GSM Sri Lanka

41303 CellTel Sri Lanka

41401 MP***M

41501 FTML Cellis Lebanon

41503 LibanCell Lebanon

41601 J.M.T.S Fastlink Jordan

41677 MobCom Jordan

41701 SyriaTel Syria

41702 94 Syria

41709 MOBILE Syrian Telecom Est. Syria

41793 SyriaTel Syria

41801 Iraq Telecom Iraq

41902 Mobile Telecoms MTCNet Kuwait

41903 Wataniya Kuwait

42001 Ministry of PTT Al Jawal Saudi Arabia

42007 Electronics App' Est. EAE Saudi Arabia

42202 General Telecoms Oman

42401 UAE ETISALAT-G1 United Arab Emirates

42402 UAE ETISALAT-G2 United Arab Emirates

42501 Orange Israel

42502 Cellcom Israel

42505 JAWWAL Israel

42601 Batelco Bahrain

42701 QATARNET Qatar

42899 MobiCom MN

43211 TCI Iran

43214 Kish Iran

43400 Uzmacom Uzbekistan

43401 Buztel Uzbekistan

43402 Uzmacom Uzbekistan

43404 Daewoo Unitel Uzbekistan

43405 Coscom Uzbekistan

43407 UZD Uzbekistan

43603 MLT TJK

43605 TajikTel

43701 Bitel Kyrgyz Republic

44010 DoCoMo Japan

45201 Mobifone Vietnam

45202 Vinaphone Vietnam

45400 Hong Kong Telecom CSL Hong Kong

45404 Hutchison Telecom Hong Kong

45406 SmarTone Mobile Comms Hong Kong

45410 New World PCS Hong Kong

45412 Peoples Telephone Hong Kong

45416 Mandarin Com. Sunday Hong Kong

45418 Pacific Link Hong Kong

45422 P Plus Comm Hong Kong

45501 C.T.M. TELEMOVEL+ Macau

45601 Mobitel Cambodia

45602 SM Cambodia

45618 Camshin Cambodia

45701 Lao Shinawatra Telecom Lao

45702 ETLMNW Lao

45703 LatMil Lao

45708 Tango Lao

46000 China Telecom GSM China

46001 China Unicom GSM China

46002 Liaoning PPTA China

46601 Far EasTone Telecoms Taiwan

46606 TUNTEX Telecom Taiwan

46688 KG Telecom Taiwan

46692 Chunghwa Telecom Taiwan

46693 Mobitai Communications Taiwan

46697 Pacific Cellular TWNGSM Taiwan

46699 TransAsia Telecoms Taiwan

46701 Sun KP PRK

47001 Grameen Phone Bangladesh

47002 Aktel Bangladesh

47003 Sheba Telecom Bangladesh

47201 DHI Mobile MV

50202 Binariang Malaysia

50212 Maxis Malaysia

50213 Telekom Cellular TM Touch Malaysia

50216 DiGi Telecommunications Malaysia

50217 TimeCel Wireless Adam Malaysia

50219 Celcom Malaysia

50501 Telstra Mobile Comms Australia

50502 Optus Australia

50503 Vodafone Australia

50503 3 Australia

50508 OneTel Australia

51001 PT. SATelindo C Indonesia

51008 Lippo Telkomsel Indonesia

51010 TelKomSel Indonesia

51011 Pro XL Indonesia

51021 IM3 Indonesia

51501 Isla Comms Philippines

51502 Globe Telecom Philippines

51503 Smart Communications Philippines

51505 DigiTel Philippines

52001 Advanced Info Service AIS Thailand

52010 Orange Thailand

52018 DTotal Access Worldphone Thailand

52023 GSM 1800 Thailand

52099 Orange Thailand

52501 Sing. Tel. GSM 900 Singapore

52502 Sing. Tel. GSM 1800 Singapore

52503 MobileOne Asia Singapore

52504 M1-3GSM Singapore

52505 StarHub Singapore

52811 DST Communications Brunei Darussalam

53001 Vodafone New Zealand

53901 O-Call ton

54101 Smile VUT

54201 Vodafone Fiji Fiji

54601 Mobilis New Caledonia

54720 Vini French Polynesia

55001 FSM Telecom FSM

60201 MobiNil Egypt

60202 Vodafone Egypt

60301 Algerian Mobile Network Algeria

60302 Djezzy Algeria

60400 Meditel Marocco

60401 Itissalat Al-Maghrib IAM Marocco

60502 Tunisie Telecom Tunicell Tunisia

60503 Tunisiana Tunisia

60701 GamCel GMB

60702 AfriCELL GMB

60801 Sonatel ALIZE Senegal

60802 Sentel Senegal

60901 Mattel MR

61001 Matitel ML

61002 Ikatel ML

61102 Sotelgui Lagui Guinea

61201 Comstar Cellular Network Cote d'Ivoire

61203 Orange Cote d'Ivoire

61205 Telecel Cote d'Ivoire

61302 CelTel BF

61402 CelTel NE

61501 Togo Telecom TOGO CELL Togo

61602 TLCL-Ben BJ

61603 Benincell BJ

61604 BBcom BJ

61701 Cellplus Mobile Comms Mauritius

61710 Emtel Mauritius

61801 Lonestar Liberia

62001 ScanCom Ghana

62002 OneToch Ghana

62003 Mobitel Ghana

62120 Econet NG

62130 MTN NG

62140 Nitel NG

62201 CelTel TC

62202 Libertis TD

62401 MTN Cameroon

62402 Orange Cameroon

62501 Cabo Verde Movel Cape Verde

62601 CSTMovel STP

62701 GNQ01 GNQ

62801 Libertis GA

62802 GAB TeleCel

62803 CelTel GA

62901 CelTel CD

62910 Libertis CD

63002 CelTel RC

63004 CellCo GSM RC

63089 OASIS

63102 Unitel AGO

63301 Seychelles Cellular Services Seychelles

63310 AIRTEL Seychelles

63401 Mobile Telephone Company Sudan

63510 Rwandacell Rwanda

63601 Ethiopian Telecoms Auth. Ethiopia

63701 Barakaat SOM

63782 Telsom SOM

63902 Safaricom KE

63903 KenCell KE

64001 Tritel Tanzania

64002 Mobitel Tanzania

64003 Zantel Tanzania

64005 CelTel Tanzania

64101 Celtel Cellular Uganda

64110 MTN Uganda Uganda

64111 UTL Telecel Uganda

64201 Spacetel BI

64202 Busafa BI

64301 mCel MOZ

64501 Celtel Zambia

64601 Madacom Madagascar

64602 SMM Antaris Madagascar

64603 Sacel Madagascar

64700 Orange

64702 OMT

64710 Societe Reunionnaise SRR Reunion

64801 NET*ONE Zimbabwe

64803 Telecel Zimbabwe

64804 Econet Zimbabwe

64901 MTC Namibia

65001 Telekom Network Callpoint Malawi

65010 CelTel Malawi

65101 VCL Comms Lesotho

65102 Ezi Cel Lesothp

65201 Mascom Wireless Botswana

65202 Vista Botswana

65310 Swazi MTN SZ

65501 Vodacom South Africa

65507 Cell C South Africa

65510 MTN South Africa

71201 ICE CRI

72235 Port Hable ARG

72402 TIM Brazil

72403 TIM Brazil

72404 TIM Brazil

72431 Oi Brazil

732101 Comcel Columbia

73401 Infonet Venezuela

73402 Digitel Venezuela

74601 ICMS SR

74602 TeleG SR