This is really a note-to-self because the StarHub website http://www.starhub.com/maxmobileprepaid/selfhelp is horribly broken (aka it needs and works with Internet Exploder only) and I have not been able to use the service since I bought the pre-paid card. How someone can even design and deploy a disaster I cannot fathom.

This StarHub website does not tell me exactly how to activiate the service via SMS and found that the info is buried deep in their manual.

So, for the record this is how it can be done via SMS to 6782:

 2M1H => 2.0 Mbps speed; 1 Hr plan
 2M1D => 2.0 Mbps speed; 1 Day plan
 2M3D => 2.0 Mbps speed; 3 Day plan
 2M5D => 2.0 Mbps speed; 5 Day plan

 7M1H => 7.2 Mbps speed; 1 Hr plan
 7M1D => 7.2 Mbps speed; 1 Day plan
 7M3D => 7.2 Mbps speed; 3 Day plan
 7M5D => 7.2 Mbps speed; 5 Day plan

For the 2Mbps plan, the download speed is 2Mbps, upload 384kbps, while the 7.2Mbps plan has a 7.2Mbps download and 1.9Mbps upload speed.

So, there, no more secrets. Someone, buy StarHub marketing a cluebat!