I bought MTS ultra wifi 2 months ago . they say it will give 9.8 mbps speed. I used it in north,east and west delhi it gives 2 mbps speed on average . That's not bad but it's not even half that they promise.
sometimes it doesn't work. maximum for an hour and that happens once a week on average. The worst part of it is customer care i called them twice from my date of purchase . they once said that server is down it will not work for a month i asked them minimum days they said 2 weeks and it started working after 30 mins.
then when i again called them they said to reinstall the device and also use it in other system. i did everything but nothing worked it itself started working after 50 mins.
I bought this because only Mts is available in market which provide prepaid protable wifi service. and moreover the plans are cheaper then tata ( only postpaid available )
The remaining balance can be carry forwarded to next month if recharge is done on time.
If you want to buy cheap portable wifi and you can manage if it doesn't work for sometime then you must buy this.
It works smoothly, no disconnection problem in between .