i was also on the same plan as
@Ethan_Hunt earlier on MTNL. 8AM-8PM 1 mbps and 1.5 mbps thereafter, and 1.5 mbps for the whole day on Sundays. was best in that price-range. however they discontinued it sometime back and introduced crappy FUP-based plans, and automatically changed my plan to the present '2 mbps till 8GB and 1 mbps thereafter' plan. earlier it wasn't like this. if you were on a plan which was later discontinued, you could still continue on the discontinued plan unless you asked for it to be changed to the new plan. but not anymore. and yes, post FUP, you still get unltd. net at reduced speeds.
my present primary connection (ie, from pvt. ISP) is also an unltd. one and without any kind of FUP. its from Honesty Net (bandwidth provided by it, and connection provided by Dolphin Infonet). service of this service-provider is amazing! for instance, got an SMS today evening that on account of lightning (heavy rains and fierce lightning here since y'day) the net-service would be shut down for 2 hrs, and within seconds after that it happened. resumed after the stipulated time. they are on WhatsApp too. Honesty Net is I think based in Kurla/Chembur? not sure. you could search about it. should be well worth if you could get a connection from someone (good) providing bandwidth from HN.