I would rather suggest Dialog cause of Data Connection Plan, Here is the summarized explanation,
Data Connection packages
Dialog offers you a daily rental internet package for Rs 20 where you get 100 MB free, 150 MB data for Rs 29 with a validity of three days, 350 MB data with validity of 7 days for Rs 49, 700 MB data at Rs 99 with a validity of 21 days and 2 GB data at Rs 199 with a validity of 30 days. Hutch has two offers for the internet service- the Pocket Internet with a quota of 500 MB data with a maximum validity of 15 days and the Value Mega Internet Pack with a maximum limit of 35 GB data.
Apart from that, they have Day and Night Internet service, Non Stop Internet and other host of data packages. Etisalat has a host of internet packages with a maximum quota of 12 GB for Rs 1500 with a validity of 30 days. Mobitel has internet services like Internet Chooti, 3 day, 7 day and 21 day internet services with different subscription rates. Charges of excess data usages shall be levied from the balance.