Why are my someone else's received calls showing up in my recent call history?

[iMore Question]

My boyfriend has received several calls today and when i look at my call history they are all there on my phone.

 

[HankAZ]

My boyfriend has received several calls today and when i look at my call history they are all there on my phone.

Are you and your boyfriend sharing an iCloud account? That's what usually allows this to happen.