You need to use a API script to check excel files with phone numbers to see which phone operator every phone number belongs too.
You will write a software that will open excel files (databases) with information (like phone number, adress etc) to construct a new database with this information.
Only apply to this job if you have 8-10 hours free to work every day for 2-5 days.
I will give you detailed instructions after you have confirmed that you have the time to do this project.
Maybe I will change the price if necessary.