The Concordium Mobile Wallet has been renamed to Concordium Legacy Wallet with the release of the new Concordium Wallet for iOS. If you are creating your first identity, Concordium recommends downloading and using he new Concordium Wallet. You can read about the new Concordium Wallet and the differences between it and the old Concordium Legacy Wallet in the FAQ.
Note: It might take a while before the new version is rolled out to your AppStore. If you cannot see it, please check back later.