Are the unlimited call plans from BSNL also unlimited for data

Not always! Most "unlimited call" plans from BSNL come with a daily data limit, like 2GB or 3GB per day. Once you use up that daily data, your internet speed might slow down. However, some special plans, like the Rs. 398 plan, do offer truly unlimited data with no daily limit, along with unlimited calls. So, it's good to check the plan details carefully to see how much data you get!