T500 mobile broadband issue in South Africa

[Sainty]

Hi all, I have a t500 running winsows xp. My broadband card is: Ericsson F3507g Mobile broadband Minicard adapter for WCDMA 2100/1900/850MHz as well as GSM/GPRS/EDGE 850/900/1800/1900MHz broadband. I would like to replace this card/adapter with one which has the following features:
WCDMA/HSPA+/UMTS 2100/1900/900/850MHz,
GSM/GPRS/EDGE 850/900/1800/1900MHz
Wimax.

Is there a card available from Ericsson or Lenovo or elsewhere which has the above specs?

Please help as I am very frustrated by our mobile network operators here in South Africa.

Regards,

Sainty