^ ^ ^
Not sure why it would not work with TATA / MTS OMH SIM. AFAIK, no APN should be needed. In Reliance it is working without any APN through OMH SIM. Still if new APN is not created / saved from settings menu, you can try this method,
Warning: Do not mess with any other setting in Programming Menu unless you know what it means. You may make your perfectly working phone a glorified paper weight.
Open Phone Dialer
type #073887* and tap phone receiver button
New window will open asking SPC password, Enter it and tap verify
Programming Menu will open
Scroll down to 17. APN Controls & tap
Tap APN Config Edit
Tap On top right 3 dot setting
Tap New APN
Enter APN Values & save