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2G Mobile Recharge Plans in India
Best mobile operators in India are: Airtel, BSNL, Jio Reliance, Vodafone, Idea, T24.

Most popular recharge types in India are: 2G Data, 3G Data, 4G Data, FRC, Full Talktime, ISD, Local, Plan, Roaming, SMS, STD, Top up.
Can I recharge 2g plan in 4g SIM?
Any SIM will work in any device
You can use a 4G SIM card in a 3G or 2G phone or a 2G or 3G SIM card in a 4G phone. Anything is possible.
What is unlimited 2g?
Airtel has launched an unlimited internet offer for its 2G prepaid mobile customers across India. Priced at Rs 149 this pack offers 2 GB of 2G data beyond which the internet speed is limited to 40 Kbps.
How can I buy Airtel data?
The Rs 100 data add-on pack will offer 15GB and the Rs 200 pack will offer 35GB data.

Airtel also clarified that the benefits for the additional data will be limited to the current bill cycle. This means that they can't transfer this data forward in the next month. This means that any pending data will expire at the end of the current bill cycle at the end of the month.
What is STV data?
What is STV Plan in BSNL? A voucher which reduces the basic tariff upto 90-100% (even unlimited also) on recharge with a special amount is called BSNL STV Plan.