Vodafone customers can avail this benefit simply by sending the SMS Go 4G to 199.
To enjoy this offer, Vodafone customers in Haryana, should possess a 4G-enabled handset and active Vodafone 3G pack as on 24 August, the company said.
This is similar to the offer made by Idea when it launched 4G.
A formal announcement on the commercial launch of 4G services will be made shortly, the company said.
With this, the total 4G enabled circles has risen to six for Vodafone, including Mumbai, Delhi & NCR, Kerala, Karnataka and Kolkata.
Vodafone is also in the process introducing it in UP East, Gujarat and Bengal circles.
4G ready SIMs are available at 250 Branded Stores and over 5,000 multi brand outlets across Haryana, Vodafone said.