Speed would vary between 50-85kbps. Never think of getting 144kbps(not 153kbps) even in dreams.

The speed they are mentioning is from network tothe modem phone not 2 ur pc.Its Useless if you want to use voice chat like application as the latencyis quite high also data flows in jitters.While its a wireless network so no downtime but speed come to zero inbetween so you have to disconnect and reconnect.Would never recommend if you wanna download heavily.