How can I reset my Apple ID if I don't recall the trusted phone number?

Seems you no longer have access to your only trusted device:

Apple support have an article online (link below) that may help you:

eg: You may be able to regain access to your account after a waiting period:

See: How to use account recovery when you can’t reset your Apple ID password - Apple Support

Wast3dDaz3 Said:

"How can I reset my Apple ID if I don't recall the trusted phone number?: I need to reset my Apple ID passcode but I cannot. Access the trusted device.. cannot remember the number"

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Get the Phone Number Changed...

Contact Apple Support:

Ask the Apple Rep to modify it over the phone. If permitted to do so, then inform the Apple Rep to modify the Phone Number associated to your Apple Account, to what it should be. Important: Perform a Trial & Error login session with the Apple Rep prior to ending the phone call.

Contact ApleSupport. 

• Contact Us - Choose Locations
• Proceed from there as Necessary
• Why the Wait: Phone calls are taking a bit to go through at the moment, due to lots of calls. With the Coronavirus Pandemic, many are at home at the moment, with much time on their hands to contact Apple. So, just stay on the line, and you will get through :)