The stock climbed 6.18 per cent to settle at Rs 79.90 on BSE. During the day, it soared 7.84 per cent to Rs 81.15.
At NSE, shares of the company rose 6.3 per cent to end at Rs 80.05.
The company added Rs 1,157.95 crore to Rs 19,886.95 crore in market valuation.
In terms of volume, 32.75 lakh shares of the company changed hands at BSE and over one crore shares were traded at NSE during the day.
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Russian tycoon Vladimir Evtushenkov-controlled AFK Sistema currently holds 56.68 per cent stake in SSTL while Russian government owns 17.14 per cent interest. Shyam Group has 23.98 per cent stake and the rest is owned by small investors.
SSTL offers mobile telephony services under MTS brand across nine telecom circles in the country.
"RCom will acquire approximately 9 million customers and approximately Rs 1,500 crore of annual revenues by virtue of the transaction," the company said in a statement.