The company said that it has opened up 362 retail outlets at the same time in one day.
"This 1-day record took Uninor 75 days of planning and 5,400 hours of execution involving 200 retail employees covering 1,50,000 customers in its six operating circles. It is Uninor's retailers and Uninor's customers that have together made a Guinness World Record today," Uninor Chief Marketing officer Rajeev Sethi said in a statement.
"This means that our SIMs and recharges will be available at more shops and much closer to where a subscriber is than virtually any other operator," Sethi said.
Uninor has operations in six telecom circles- UP (West), UP (East), Bihar (including Jharkhand), Andhra Pradesh, Maharashtra and Gujarat.
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Uninor identified areas where it has subscriber base of about 10,000 customers and had no stores within 5 kilometers of radius of such areas.
Currently, Uninor has 1,100 operational stores. By opening of these additional stores, it takes its overall footprint to 1480 stores - making it the second largest among all operators in its circles, the statement said.
The retail expansion has come on the back of a company statement in February announcing an investment of Rs 500 crore to expand its network and distribution infrastructure by 30 per cent in its six operational circles, it added.
Telenor has sought government's approval to raise its stake in Uninor to 100 per cent from about 74 per cent at present with investment of Rs 780 crore.