You would need to contact support with that number and they will assist from there:
How can I find what ICloud ID i used on my Iphone7 plus based on IMEI or Serial number because I forgot ID I set it up and I am new on Iphone
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How can I find what ICloud ID i used on my Iphone7 plus based on IMEI or Serial number because I forgot ID I set it up and I am new on Iphone
How to find my Icloud id based on IMEI