I purchased a new iPhone 11 and have already set up everything. My old phone is still signed into my account but with no sim card. Do I need to do anything extra before I erase the old phone to prevent loosing any information on my new phone?
iPhone 7, iOS 13
The following procedure will not affect anything on your new phone: What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support
The following procedure will not affect anything on your new phone: What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support
Erasing old phone
