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there is a mycelium app for ios, but i must say its way different than the android one. you cant import or export private keys, the transactions seem to show up extremely late
Where you found a mycelium for ios? AFAIK there are just for android:
https://mycelium.com/bitcoinwallet For ios you can use greenaddress or breadwallet.
https://bitcoin.org/en/choose-your-wallet