3.6 MBps will do for now haven't come across any one getting more than 2MBps ...if speeds go more than 4MBps better get the 21.7MBps rather than 7.1 MBps one...no point getting a new Stick now until unless u have problem with ur current one..But my concern would be which will have better Networking support....so more devices can be connected to it rather than one..
Many prefer unlocked Huawei 3g modems, i don’t think you have 14mbps modems in huawei
Option icon 505 is 14mbps data card, priced around 2400 @ ebay.in , alcatel x300 a bit more.( letsbuy @ 2672rs using rcomlb1) Option 14MBPS 3G Usb Modam 14.4 Mbps | eBay
from a delhi seller, you can get for around 2160rs using 10% off idea coupon but the problem is that you don’t have many reviews of this data card from Indian users, don’t know whether it supports ussd option or not.
I use bsnl 3g and airtel 3g on my huawei umg1831 no issues, anyway huawei e173 is better option for you.
You can get huawei e173 for 1463rs using coupon. Huawei E173 3G usb modem Data Card 7.2Mbps HSUPA Model | eBay
he looks good seller to me.
I have used my friends e173 (7.2mbps), no issues with it, but downloading speed fluctuated in between 600-900 kBps , where as i got constant 900 kBps with my huawei umg1831 on airtel 3g. Signal strength was same with both data cards , -83dBm ( mdma) . My tower is 7.2mbps enabled. https://i.imgur.com/qM085.jpg