bech32 addresses for segwit support in mycellium and coinomi?
Mycelium doesn't support segwit at all right now. I don't know about Coinomi but it looks like they support Segwit (at least receiving from a segwit address) but not BIP 0173. Since neither support this format, there's no way to generate bc1~ address within the wallet, so no way to send any bitcoin to them using this format.