Having got my new China Unicom WCDMA 3G number, I was somewhat confused that (a) data service worked through my China Mobile settings (b) it didn’t work using the settings Unicom customer service provided, and (c) I found yet another set of settings that can be used.
Whilst I still don’t know why the above is true, I found the following:
1) Use China Mobile settings (APN: CMNET) for GPRS / 3G Data with no proxy works fine. MMS should be received using WAP profile (APN: CMWAP , MMSC: http://mmsc.monternet.com , Gateway or Proxy: 10.0.0.172. Port 80 for HTTP, port 9201 for WAP)
I don’t know if this is just compatibility, or a problem with China Mobile’s network.
2) The settings Unicom customer service now provide will only work through a proxy.
GPRS APN: 3gwap
WAP APN: 3gnet
- for both must set proxy through 10.0.0.172 . These settings provide support for web (HTTP) traffic only.
3) Older data suggests to use:
GPRS APN: uninet
WAP APN: uniwap
MMSC: mmsc.myuni.com.cn
- I use this and it works. No proxy needed for GPRS ; but use 10.0.0.172 (as above) for MMS. Works across all protocols (MSN, FTP etc…) unlike 3G settings.
Therefore if you have a China Unicom 3G card and have been given the new settings, don’t bother. It’s just more complicated, and using 3gwap non-HTTP based services will not work.
Note: I’ve subsequently discovered this site claiming that for certain applications like Mobile Television you must use the 3G settings. I haven’t tested.
Update: iPhone users will find that they can no longer change APN settings for China Unicom. Carrier settings are now auto detected upon insertion of SIM card and cannot be modified. Data therefore should just work.