First see your mobile have wifi.
I have Bsnl iti modem.
Go to your browser in computer.
fill the user name and password
username = admin
pass = admin
Click on advance setup and then wan.
edit 0/32 column.
chose ppp over enternet (pppoe)
Enter ppp username and password
ppp username = your bsnl username
ppp pass = your bsnl password
service name = dataone
click next and next
click on save and then click on save and reboot
MOdem will restart
pick up your mobile open browser and search for wifi and go.
modem bsnl iti
same for all nokia n or e series and 5800xm like
If you have a different modem go to modem setting with 192.168.1.1
and look out for 0/32 column in wan option
NO need for any special software.
NO need to enable unup.
No need to activate gprs.
NO need to mention modem and mobile name.
Wifi settings for iti modem or other modems.
SSID- As you like (Example -ITI)
AP Mode:Access point