The lock-in period will, however, apply to the company resulting from the M&A.
The long-awaited guidelines pave the way for fresh investments through consolidation activity in the industry which has 12 telecom service providers.
Some firms have been reportedly eyeing to buy majority stake in Aircel and Tata Teleservices but were waiting for government to release the final guidelines. Both TTSL and Aircel have spectrum allocated at old rate of 1,658 crore.
The market rate determined through auction will remain valid for a period of one year. Thereafter, additional price calculated based on prime lending rate of State Bank of India will be added on to determine the market rate.
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The guidelines further said that the merged entity will be allowed to hold a maximum of 25 per cent spectrum allocated in a service area and 50 per cent in a particular band for telecom services under the rule.
A merged entity will be allowed to hold a maximum of 2 blocks of 3G spectrum in a service area. This rule will check amalgamation of more than two 3G spectrum holding companies.
GSM industry body COAI's Director General Rajan S Mathews said: "We welcome clarity in M&A policy. We now expect 4-5 operators in each circle. However, step up cost on spectrum that was not acquired through auction and lock-in period are matter of concern."
As per the new rules, if companies holding spectrum at the old rate opt for buying another company they will have to submit one-time spectrum fee as bank guarantee to the Department of Telecom.