@senthilb007: Thanks. I've put in my request too. Was told that the change would be effected after 24 hrs. :inodding:
@RockingIndian Thanks !!! Mine is changed and I am now in 625CS1 (Special for AP, Gujarat, Punjab).
The 500C plan is good, but we need to schedule the downloads, which was also possible. And during the [non 2AM-8AM] period, the usage sometimes goes more than 1.5GB so it makes me to pay more to BSNL. Otherwise that plan (500C) is great and you can schedule to download 4.5GB minimum during that 2AM-8AM time. So 30X4.5GB = 135GB minimum you can download in that plan. The average speed in this 500C plan is 240KBytes/Second. That was amazing.
The same is also possible in 750C plan, but we need to download the whole day since the download speed is 256Kbits/second (i.e., 30KBytes/second). The facilities in 750C is brought in 625CS1 plan. In fact we have 100free calls and NO rental for phone. And this April 2010, the doubled the speed, so we can enjoy 512Kbits/second (i.e., 60KBytes/second). Since I use internet radio through the wifi, I prefer this at this moment. Let me see how it goes...
Those who are looking for the selfcare website, it is here [/URL]
For all, regarding the change of plan...
1) The BB plan change in AP is actually accepted through BSNL's 1500 phone number itself. Other states (at least in Tamilnadu) require a person to give the request in written format. And this BB plan change will be effective on the next first date of your billing cycle. This is mostly 1st of every month (I believe).
2) The BB plan change request in Hyderabad is effective within 24hrs (at the maximum 48hrs) and you can get the change of plan done anytime and any number of times within a month. Let us say, by 02/APR/2010 you asked for a change from 500C to 625CS1, and it becomes active by 04/APR/2010. And you can request for a change from 625CS1 to 500C+ any day after 04/APR/2010 (lets say 06/APR/2010) and it will be effective from 08/APR/2010

... For all these changes, the charges will be levied at pro-rata basis.
I got to know about this 2 days back from BSNL customer care. Perhaps you may please check this with BSNL by yourself.