Well having a phone number shouldn't make a difference. Unless the files were on a cloud account attached to a phone number. If they were on a phone (not number) then you would have to get them off that other phone. If they were on this same physical phone, and you accidentally deleted them, then you can try the following...
While there is no guaranty that you can get them back. Deleted does mean deleted. There are a few apps/programs out there that 'may' be able to help you recover the data.
A few of the programs you could try would be... DiskDigger, MobiSaver, Android-Recovery and Tenorshare. They are all data recovery apps/programs. There are many others out there, so check around and see which you would rather try. There is also...