Jump to content
  • Sign Up

Can't connect to 3G and 4G


Recommended Posts

I bought a sim card with 800mb per month. But I can't seem to get the data enabled. I'm using android bought from Japan, do I need to set up an access point name?

Others are doing fine with their phone amd data. Not sure what's wrong with my phone.

Link to comment
Share on other sites

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.

  • Like 1
Link to comment
Share on other sites

Join the conversation

You can post now and select your username and password later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Click here to reply. Select text to quote.

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...