I can help you fix your problem. Read out loud at least an hour a day to yourself. The key is rewiring your brain. You have to hear fluency from your lips. You stutter because of the memories. Speak slowly. 4 to 5 words at a time. Come to a complete stop, then start again.As far as phone conversations , quick trick, imitate someone. Use a different accent. You won’t stutter. If you need any more help, let me know.