Our IOS app is temporarily unavailable on Apple Store.
We are currently investigating the issue. Your funds are safe on the blockchain. Your previously downloaded version is active and should work on your device. You can always restore your funds with a backup phrase and access the wallet on another OS. Please make sure you have your backup phrase saved offline in a safe place. You can find 12 words in Settings -> Security -> Private keys & Backup page. Never share them to anyone!