NOTE
for ZTE USB MODEM, u need to disable the auto run first before plug into router, otherwise the router wont recognize your modem.

For window xp :

-> plug in your zte modem in pc/laptop
-> wait for your pc/laptop to recognize your modem ( close the dialer if it pop up )
-> click start
-> click run
-> type in CMD ( comand prompt )
-> type in AT+ZCDRUN=8 (Disable cd /flashdrive autorun )
-> press enter
-> done ( u will see a message showing that autorun is diable now )
-> unplug your modem from pc now
-> plug it into TP Link 3G router
-> router will auto recognize it now and start dialer your ZTE modem

For window 7:

->plug your ZTE modem into your pc/laptop
-> wait for pc/laptop to recognise it ( close the dialer if it pop up )
-> click start
-> enter CMD in search column
-> type in AT+ZCDRUN=8 (Disable cd /flashdrive autorun )
-> press enter
-> done ( u will see a message showing u that autorun is disable )
-> unplug the modem from pc
-> plug it in your TP Link 3G router
-> router will auto recognize it now and start dialer your ZTE modem

bang, celcom thread lor