I don't see a good alternative to coinomi for segwit addresses right now. I hope, mycelium will update some day to segwit, because its the best and securest android wallet in my opinion.
Samourai it's a way better option (and IMO the best Segwit mobile wallet).
Mycelium is looking pratically dead in my eyes after the whole ICO fiasco and how it's been 7 months since the Segwit activation and they don't even have plans on supporting it (they plan to release BCH support first - which is sad).