Sorry, I'm not sure I understood. You interact with the phone and you can't call anyone? Are you sure you have someone's phone number? Have you read the letter in your mail where they give you the number when you reach enough love points?
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Okay, I already found the bug. This bug appeared as a result of the latest fixes I made in the game. What’s happening is that the event to call the girls on the phone is being triggered at the beginning and at the end of the conversation with the girl. But since you still don’t have any of their phone numbers, no option was showing up. I’ve already fixed it, so this won’t happen to you in the next update. Thank you very much for the report, and I apologize for the inconvenience.