Find Samantha's Phone Number

You are new to a high school. You have one new friend, Samantha. You asked her cell phone number, which is a ten digit number. But she denied to give it to you directly. She gave you a riddle to find her phone number. She told you that the last ten digits of the number X is her phone number, where X is \( {2014}^{2015} + {2015}^{2014} \) .

Find which digit is at most repeated in her phone number.

Edit : Her phone number isn't \( 9876543210 \) - in which all digits are repeated only once.

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