tata photon plus not working after upgrading OS X Yosemite?
If you try to download the drivers directly from Tata Photon + or Service Provider ( Tata) website it will not work as the drivers are not compatible with the Mac ( Yosemite).

If the manufacturer of your device is huawei, go directly to their driver site and download the drivers. 

Use the following link to go to driver site 

http://consumer.huawei.com/en/support/downloads/detail/index.htm?id=31322

Search for following driver for tata photon+

Mac-V200R003B015D11SP00C983(for Mac10.10)

Once you install the driver, it will create mobile partner in your launchpad. Make sure you Use mobile partner and don't use the auto connect app of tata photon+.

If you have any query you can reach me at khushindergill@icloud.com or khushindergill@gmail.com