Verizon
Verizon maintains an independent database for their Call Filter App
Calling parties and customers who believe a call has been mislabeled as spam or blocked may provide feedback via the link below
https://voicespamfeedback.com/vsf/
T-Mobile and associated apps
on CallTransparency.com you will need to manually enter each number or upload a CSV file of you numbers and provide you business information. They will call them to confirm they can reach the company name you provided. Make sure all of the numbers you submit, go to a welcome recording, IVR, voicemail or human that will say your company name for them to hear and confirm.