I want to use another old phone to play Pokemon Go, my old phone has Android 6. I have installed Pokemon Go correctly from the Google play store but it remains blocked to the choose date page, I can't do anything. I allowed all permission when it asked me. This phone doesn't have a sim card is that a problem? If I try to click something nothing happens. What can I do?
You need an internet connection to play Pokemon GO. A SIM card gives you easier access via mobile data, but it's not needed. You can also use Wifi or connect to another phone's mobile data with mobile hotspot. Not having a SIM card will not cause this issue, but not having an internet connection will. I recently got to that screen on a phone without a SIM card and proceeded without issues.
Have you tried restarting the Pokemon GO app and reloading it? The app getting frozen or stuck in certain parts of the game is a very common issue, and this regularly solves it.
This question was answered in the comments: Pokemon GO does not support rooted/jailbroken devices.
My phone doesn't have a SIM card yet I can play it, so no, that isn't a problem.
Things you can do that may counter this issue:
Uninstall and reinstall the app.
Restart your phone
Shut down the Pokemon GO app completely
It looks like your phone is stuck on that particular app.