If you wish to monitor the usage of your Photon plus prepaid connection, you have to register for an account at www.tataindicom.com.  A new user has to provide the phone number and an email address to create an account.

The usage is shown in 2 formats, in terms of Rupees and in the number of bytes used during each session.
They also send alerts by SMS to your mobile with details of the balance remaining in your account. However the usage data has not been updated since 12 May, 2010. Though the connection has been used several times, the balance has not been updated/ reduced.