Dewey Ballantine has secured a leading role advising Greece’s biggest wireless operator Cosmote on the acquisition of 42% of southeast Europe’s leading mobile phone retailer Germanos for about $1.58bn (£836m).

The deal, understood to be a precursor to the launch of a full public offering for the remaining shares, sees the US firm advising the company on international finance aspects led by London capital markets partner Camille Abousleiman, assisted by associate Christopher Lenton.