M&A, IP, Patents Xavier Niel is planning a $4.1 billion takeover of Latin American operator Millicom via a holding company called Atlas Investissement. The investment firm already holds a 29% stake in the operator and is considering an all-cash takeover. Millicom operates under the name Tigo in nine LatAm countries. European operator Digi Communications is bidding to acquire Telekom Romania Mobile from Greek operator OTE. The deal is subject to diligence checks. T-Mobile has agreed to buy most of the assets of UScellular for $4.4 billion. The assets include UScellular’s customer base, its retail stores and some of its spectrum licenses. Initial reports had suggested that Verizon would also buy assets, but for now T-Mobile is taking the majority. 5G…