携帯に電話して(Keitaini denwa shite:) is same as
携帯に電話してくれる(keitaini denwa shitekureru)Or
携帯に電話してくれるかな(keitaini denwa shitekureru kana)
They are all Casual way to say "Please call to my mobile phone."
You can also say 携帯に電話してください(keitaini denwashite kudasai) which is the polite way to say "Please call to my mobile phone" when you don't know this person or you need to talk to this person in a polite way.