Вот переработанные варианты на английском. Можно выбрать подходящий стиль.
Вариант 1 — нейтрально/formal I haven't heard anything about him since then, and I don't even know whether he went to France or not. If you know his address, I would be very grateful if you could call me. I have tried calling you several times, but your phone doesn't seem to be working.
Вариант 2 — разговорный I haven't heard from him since then, and I don't even know if he went to France. If you know his address, please give me a call. I've tried calling you several times, but your phone doesn't seem to be working.
Краткие пояснения:
- "haven't heard anything about him" чаще говорят "haven't heard from him" (если речь именно о контакте) или оставляют "heard anything about" в зависимости от контекста.
- "France" исправлено с правильного написания.
- "I would be very grateful if you could phone me" можно оставить как "call me" в разговорном стиле.
- "I have tried calling you" или "I've tried calling you" — правильная форма и естественная последовательность.