One of the first things that I did upon getting my Samsung Galaxy Tab 7.7 was to ensure that the Singtel 3G APN settings are correct. At first glance it looked like the local sets of the Galaxy Tab 7.7 GT-P6800 did ship with more or less the correct CSC (Country Specific Code) package which contains appropriate APN settings for all the 3 Singapore telcos Singtel, M1 and Starhub.
This seems to work fine, except that in certain areas I would only be able to get 2G coverage with the attendant low speeds (i.e. no high-speed 3.5G or HSPA+ speeds, indicated by a H+ icon at the lower-right corner of the screen), but then it was going fine with H+ on my Galaxy S2 on the M1 network. On the Hardwarezone forums, I've read that you can configure it with slightly more optimized settings as follows :
Name: IDEAS E-mail
MMS proxy: 184.108.40.206
MMS port: 8080
Authentication type: PAP or CHAP
APN Type: internet + mms
APN Protocol: IPv4
- The rest of the settings are "not set".
With the above, after a few days of testing, there did seem to be improvement in being able to attain H+ speeds more often and at more locations. Upon further examination, apparently these settings are a combination of the pre-defined IDEAS E-mail and IDEAS MMS settings. Funnily enough, the addition of the MMS settings shouldn't have made much of a difference but it looks like it did at least for my case.
The screenshot above shows the settings as they look on my device. To get here, go to Settings, Wireless and networks, Mobile networks, Access Point Names. As usual with this kind of thing, YMMV (Your Mileage May Vary), but if you're on an Android device and using the Singtel network, you could consider giving this a try.