You can use JAM on iOS, that's the only tool I'm aware of.
Discussion
https://sovrnbitcoiner.com/an-iphone-enters-the-poolside-chat/
I wrote this a while back. Total hack way, but technically able to initiate whirlpool spends from iOS. Then spend those post mix UTXOs from something like BlueWallet.
Downside of course is you don’t get post-mix spending tools like Stonewall/S2X since you’re using BlueWallet to construct the transactions