I tried it on my K610i and with my Smart buddy sim, I used the SE PC suite to connect to the internet The PC suite indicated I am connected to the GPRS network. However, the cellphone indicated I am connected via 3G.
Bandwith tests on speedtest.net indicated I am getting 500kbps download speed, 50kbps upload and 380ms ping times, all on the Makati PLDT server.
I transferred the sim to my Huawei E160 modem. Connecting and again testing on speedtest.net, indicated I only had 350kbps maximum download bandwidth but also 200kbps upload speed. The ping time was less than half previously @170ms. Using the utility MDMA, while connected indicated I am connected via HSDPA.