Can't log in to yahoo anymore, need urgent help?

Hello, I haven't been able to access my email since yesterday. Because a certain time limit had expired, I had to log in again, and that's where the problem arose. I used an old phone with an old number to log in, but I've had a new number for a year now, and so I can no longer access the old number to log in. I still know the password, but there's no way to log in using just my password. I urgently need help, please.