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Kenny,

Why when we roaming to Japan, we can use 3G phone to log on DoCoMo's service, so I suppose we have a similar network (WCDMA).

Then why their phones cannot be unlocked and use in Hong kong lei?

Kenny~~

大哥, network 制式同手機, 兩回事! 手機我識少少, 但日本 network ........ 我用都未用過!

而且 Kenny 成世人都未去過日本 ...........

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退一步海闊天空!

hai ar

我兩個妹就今日出發左去日本掃貨, 我想今個 Chrismas 去一去 .......... 但 ........ !!

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退一步海闊天空!

Why not going?

I have doubt because why cannot take their phones to use in HK so I ask lot

Most Japanese phones are designed and manufactured for a specific carrier. They can't be used elsewhere because their firmware does not support other networks.

The recent Sharp phones are unlockeable because they're designed to be sold in the international market as well as the Japanese.

Now, we have someone who knows the answer

Thank you!

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退一步海闊天空!

曾經聽人講過，DoCoMo 3G 網本身唔係 WCDMA 標準。但唔知由幾時開始，部份日本地區如：東京、大板跟番國際 Standard 同時保留舊有網絡，所以解釋到點解我地去日本既時候可以 Login 到 DoCoMo。

有時間，上 DoCoMo 網頁睇睇，當地客戶出國漫遊，一向都要租機。我記得上次去日本行經 DoCoMo 門市，佢地提供出國租機服務既機種係：

Motorola A835



可能 DoCoMo 都覺得部野唔掂，所以最近發表既新 3G 機，都 Support 埋 GSM 制式，等佢地 D 客唔駛租機都可以隨時出國漫遊。

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- 吸毒工程系榮譽畢業生 -

DoCoMo's FOMA network is based on 3GPP R99, which is an old specification. Most other 3G networks use 3GPP Rel-4 (or perhaps one of the newer specs). Some phones designed for one spec might not be compatible with a network using another spec, that's why you might have problems using FOMA phones outside Japan, and vice versa. Maybe you're just lucky that your phone is compatible with both specs. I'm not sure if DoCoMo has started implementing Rel-4 or not.

但機票同酒店都貴，right？

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由某階段開始, 錢對我已經唔係一個大問題

時間 + 責任反而令我頭痛!

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退一步海闊天空!

哦！明解！

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I see~ thanks for telling me that~
I can see many Japanese go overseas with a rent NEC 900iG wor~ hahaha

Their WCDMA was started as WCDMA-TDD, and now some areas have WCDMA-FDD (which the rest of the world uses for WCDMA 3G) like what VR-HOS said.