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Originally Posted by kimdo
It means my Huawei e583c is a outdated device, so it can't detect the network?
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No, the E583C is still a perfect device. Just the network list of its firmware lacks an entry for that particular network in Macau. As I wrote above
operation is not affected - your device can work flawlessly on this network and actually it was registered to the Three network in Macau. It just won't display the proper network name.
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Although it can't find the network name, but still can operate for browsering?
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Yes.
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Besides, what is UMTS? In Huawei settings, there is WCDMA preferred but no UMTS option?
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UMTS/HSPA = WCDMA = 3G. It's all the same and it's the fastest network technology which your device supports.
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Besides, I know that under the Dial-up > Mobile Connection, there is a Connection Modes (Auto/Manual), next to it is a click box "Automatically connect even when roaming". Should I need to click it? It is a 3G roaming selction? Someone told me it will be hepled when travelling in other countries.
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Usually you should better not activate this option as otherwise your device may connect while roaming abroad which would involve prohibitively expensive rates that will quickly eat up your credit. However your question hinted me on another possible explanation for your issues in Macau:
This list shows different network codes for Three's 2G (455-03) and 3G network (455-05) which is rather unusal. Every SIM card has a serial number called IMSI (
International Mobile Subscriber Identity - Wikipedia, the free encyclopedia), which starts with the MCC/MNC-code. Now if your Macanese SIM card has an IMSI from Three's 2G network (starting with 455-03) and your device was registered on their 3G network (which has a different network code) your device would have considered the 3G network as being a roaming network, which your Huawei E583C would have inidcated by an "R" in its display and which would have resulted in it not connecting automatically. In this case you would have needed to connect manually by pressing the "connect" button despite your E583C presumably was in automatic connection mode.