Hello there, Daniel. I'll provide some details to help you access your account on your iPhone.
Before attempting to log in to your QuickBooks account on your iPhone, it is crucial to first sign out from your account on your Android phone. Additionally, please ensure that you have entered the correct login credentials and have downloaded the accurate QuickBooks app on your iPhone. This will help to ensure a seamless and secure transition between your devices.
You'll want to update your QuickBooks credentials. Please refer to this article: Update or change your Intuit Account sign-in information.
I'll be sure to get back to you if you have further inquiries. Kindly hit the Reply button below. Have a good one.