4th Feb 2017:
Airtel is giving away 14GB or 512MB of data per day for 28days on 145 recharge to stop customers from porting to Jio.
This is similar to Jio 1GB per day new year offer. Airtel is giving half the benefits on Rs.145 recharge.

For comparison of Jio new year offer vs Airtel Rs.145 offer :

Jio offer is completely free vs Airtel Rs.145 recharge offer.
Jio offer got free voice calls to any operator vs Airtel to Airtel free only in Rs.145 recharge.
3000 free sms in Jio offer vs no free sms in Airtel Rs.145 offer.
Jio offere valid for 42 days left vs Airtel 28days validity of Rs.145 recharge
Jio offer available to everyone vs Airtel offer only for selected users getting it via best offers.

Here is the screenshot of best offer of Rs.145 recharge option showing 0.5GB per day(14GB) offer in myairtel app.

It may be noted that the Airtel number for which offer is shown recently generated porting code and was offered good voice call rate for 60days as retention benefit. However Airtel is still throwing away these very lucrative offers to the user so that customer could use it as main no.

Note: If this offer is not showing for you in *121*1# then on recharging with Rs.145 or Rs.148 you would get 300MB 4G data + Airtel to Airtel free calls only. So do check your best offer before.

Update: Similar 0.5GB per data offer is also valid for Rs.345 recharge if showing for you on *121*1# else you would get 1GB 4G only data.

CHECK OUT OFFER ON YOUR AIRTEL NO.