I'm in the south, and recently bought that Rp 199 bundle from an Airtel office. It's a stunning deal: for four weeks you get 1.4GB/day of data, unlimited calls to all India, and 100SMS/day.
They only needed a passport copy and a photo and somehow took care of all the other information on the form. Total cost was Rp 250, including the SIM card.
4G seems to work fine, with no slowdown I can see.
The price for SIM cards and data in India is INSANE (in a very good way)
enjoy it while it lasts - sooner or later, prices will have to rise or the quality of service will end up declining with too many on their networks without funds to invest in upgrades and congested frequencies