Does anyone know how to login on the iPhone app?

We'll have to do troubleshooting steps to ensure you can log into your account successfully. I'll outline them below.

To begin with, make sure you use the correct credentials when signing in. Then, sign in to your account through a mobile browser to verify if your subscription is still active. I'll show you how:

1. Open a browser, then search quickbooks.intuit.com. 
2. Select the Sign in tab. Log in to your QBSE account, verify your login credentials are correct, and enter them.
3. Navigate to the Settings menu.
4. Select Billing & Subscription or Subscriptions.

Lastly, reset the app's cache to refresh the data. This will remove all stored data in the app that sometimes prevents you from logging in.

1. Go to Settings, then tap General.
2. Tap iPhone Storage, then tap the QuickBooks Online app.
3. Tap Offload App.

Additionally, please use these resources in case you want to upgrade to QuickBooks Solopreneur as QuickBooks Self-employed is no longer available:

1. Go to our website’s Plans & Pricing page to subscribe to QuickBooks Solopreneur.
2. If you can still access QBSE, download all your QuickBooks Self-Employed transactions so you can copy them to QuickBooks Solopreneur.
3. Finally, don't forget to cancel your QuickBooks Self-Employed subscription to avoid paying for duplicate subscriptions.

Keep me updated when you have other questions about your QuickBooks account by adding your inquiries below. I'll respond promptly.