If you have an unlocked idea net setter. You can use any other sim in that modem. First you must create a profile for that sims.
Open the idea net setter application. Click Tools->Options...
Select 'Profile Management'. Click the 'New' button, and type a profile name.
Select 'Static from 'APN'. Type the 'APN' that based on your sim. And type the 'Access Number' placed in Authentication.(Here you can see the list of some sim's 'APN' & 'Access Numbers'). Click 'save' button.
Reliance;
APN: rcomnet
Access Number: *99#
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Aircel:
APN: aircelgprs
Access Number: *99***1#
____________________________
Idea
APN: internet
Access Number: *99#
____________________________
Docomo
APN: TATA.DOCOMO.INTERNET
Access Number: *99#
____________________________
Airtel
APN: airtelgprs.com
Access Number: *99#
____________________________
BSNL
APN: bsnlnet
Access Number: *99#
____________________________
Uninor
APN: uninor
Access Number: *99#
____________________________
Videocon
APN: vinternet.com
Access Number: *99#
APN: rcomnet
Access Number: *99#
----------------------------
Aircel:
APN: aircelgprs
Access Number: *99***1#
____________________________
Idea
APN: internet
Access Number: *99#
____________________________
Docomo
APN: TATA.DOCOMO.INTERNET
Access Number: *99#
____________________________
Airtel
APN: airtelgprs.com
Access Number: *99#
____________________________
BSNL
APN: bsnlnet
Access Number: *99#
____________________________
Uninor
APN: uninor
Access Number: *99#
____________________________
Videocon
APN: vinternet.com
Access Number: *99#