You are my angel. When your number shines on the screen of my cell phone, it makes my day. I feel very happy when you say hello, I want you by my side forever, I want to kiss you , I want to cuddle with you, I want to show to the whole world that you are mine. My love.
"You illumine my day when I see your cell phone number"
I imagine that what the sentence means is that he feels happy when he sees that the call he is receiving on his cell phone comes from her (number), I mean her number is displayed .
Is that right?