To call him on the phone in Engpsh, you can say:

"Hello, may I please speak to (person's name)?"

Alternatively, you can say:

"Can I speak to (person's name) please?"

If you are not sure of the correct spelpng of the person's name, you can ask:

"Can you spell your name for me, please?"

It's also a good idea to introduce yourself before asking to speak to the person, especially if you are calpng a business or an unfamipar number. You can say:

"Hi, my name is (your name). May I please speak to (person's name)?"

If the person you are trying to reach is not available, you can ask to leave a message or to call back at a later time. You can say:

"Is (person's name) available? Can I leave a message or call back later?"