A: Yes, but only at 2G or 3G speeds if the network still offers those bands. Since 3G is shut down, you will get 2G (0.1 Mbps). Useless.
When a network shuts down 3G, your unused data on a 3G-only plan is forfeit. Vi will not refund you. However, if you do a SIM swap to a 4G SIM (Path 2 above), Vi might credit the residual balance to your new 4G account, but this is rare for old data-only dongles. idea 3g netsetter upgrade to 4g
If you need to keep your old Idea Netsetter number (for OTPs or billing), you can port it to Jio or Airtel using Mobile Number Portability (MNP). Do not stay on Vi just because "Idea was good." Many users delay upgrading because they have a few hundred rupees of data balance left on their Idea 3G Netsetter. A: Yes, but only at 2G or 3G
A: As of 2025, Vi has largely exited the dongle market. They prefer you use a smartphone hotspot. You will mostly find third-party dongles (TP-Link, ZTE) that are "unlocked" or "Vi compatible." When a network shuts down 3G, your unused