I can help you with fluency. Your brain needs to be rewired. It takes work and different techniques. Your brain needs to hear fluency from your lips. If you can read without stuttering, you can gain fluency. Read an hour a day to yourself out loud . Do it for 2 weeks, dm me on your progress.As far as the telephone now, change your accent. Imitate someone. Or, speak slowly 4 or 5 words at a time. Come to a complete stop, then do it again.