Talking on the phone is usually the worst nightmare for anyone who stutters. When you are face to face and you block, the other person can see what's happening and they will wait. If it happens on the phone, the other person might hang up on you or get annoyed because they don't know what's going on. Some people on this thread people already gave the best advice: take baby steps to get out of your comfort zone. Ifyou stay in your comfort zone, it will get smaller and smaller until it shrink-wraps you. The more you speak on the phone, the easier it gets, that's really true! Start with calling your mum instead of texting her. Tell her that from now on, you will be practising with her. Then take the next step. Work yourself up the ladder. If you can, use self-disclosure at the start of the conversation with a new person. Say "I stutter, so please be patient if I need longer to say something." Then the other person knows what's going on and you are not so stressed. I think it is so important for any one of us to feel empowered and self sufficient and not having to rely on other people. Wishing you lots of strength and courage!