HiI am using 500 combo plan but there is only 1.5GB to use.So i think to switch over to unlimited plan.I am staying in bangalore.I want to know 1.whats the actual download speed of 750UL ?2.Is there any much difference between 500 combo and 750UL ?3.In which date of month i need to change the plan ?4.actually i have phone connection from last 6 months or more but i took the internet connection last month only.so "Is that double usage offer will be valid for me or not ?"Thanks.