发表于 2016-9-20 23:31:55
- 365 posts
Posted 01 September 2016 - 11:06 PM
Who was your carrier in Japan? (if you had a carrier at all?)
The following is the problem:
- China Unicom uses W-CDMA as a 3G standard
- China Telecom uses CDMA2000 as a 3G standard
- China Mobile uses TD-SCDMA as a 3G standard (but we can forget it as basically no phones outside China come with this).
A rule of thumb is, that Unicom's W-CDMA goes well with all European, US AT&T and Japanese NTT carriers' phones, while CDMA2000 goes weill with US Verizon, Sprint and Japanese KDDI carriers' phones.
Do you have a friend who has a China Telecom SIM card that you can try? If you can connect to 3G on that SIM, it would mean that your phone uses CDMA2000 as a standard, and you should change your carrier to China Telecom.