Due to backlash from customers, and intervention by TRAI, Vodafone now allows you to use your existing balance to activate a pack, however, the catch is that this may be done only before your Outgoing Validity expires, so that means, once every 28 days.
What I could observe is, if we are able to use main balance to activate these packs for Outgoing Validity, then:
Activate using main balance:
Rs 95: Gives back Full talktime of Rs95 and also 500MB data, increases Outgoing Validity by 28 days.
Rs 145: Gives back Full talktime of Rs145 and also 1GB data, increases Outgoing Validity by 42 days.
Rs 245: Gives back Full talktime of Rs 245 and also 1GB data, increases Outgoing Validity by 84 days.
Effectively, for no loss, you get additional 4G data as per the above chosen pack, and the Outgoing Validity increases too.
To use this option, dial *199# on your Vodafone Prepaid and follow the prompts. Choose Combo Plan / Combo Pack and activate one of the above plans. You will get back full talktime and Outgoing Validity will also increase.
Hope this helps all bros who are in a dilemma of what to do. Effective Recurring Cost per month = Rs 0. Initial minimum cost = Rs 95 (considering you have no balance in your account, else initial cost also = Rs 0).