Tata photon 3g dongle crashes after upgrading my OS to Yosemite
I found a way to make dongle work in the yosemite(Mac OS 10.10).

Go to the system preference and click on network.

In network it will show you the dongle option like in my case my dongle name is ZTEUSBModem.

And enter the phone number "*99#". Click on connect.

Your mac is ready to work with the dongle. There will be no need to run the tata docomo app.

Its working in 3g mode.

Its working good for my mac.