TIM, which owns 60% of INWIT, and Vodafone agreed earlier this year to merge their mobile tower infrastructure and to jointly roll out 5G in Italy.

INWIT's minority shareholders, whose green light was needed for TIM to be able to sign off the deal, approved the merger almost unanimously at Thursday's meeting.

After the merger, TIM and Vodafone will have 37.5% each of the enlarged INWIT.

INWIT shareholders also approved a special dividend totalling 570 million euros ($634 million), equal to 0.5936 euros per share, once the merger is completed.

The 10 billion euro tie-up is awaiting European Union antitrust approval and is expected to close in the first few months of 2020.

(Reporting by Elvira Pollina, Editing by Gianluca Semeraro and Mark Potter)