You may already suspect that your time management needs improvement, since you probably are more stressed than you would like to be and busier than use, though getting less done. Know what you want. Use A so you can achieve B. Apply the ABC approach to your current career or business goals. If the phone helps you gain information and conduct business, it can be a time saver, especially if a visit would be costly or time-consuming. Manage the phone and don't let it manage you.
Phones are intrusive.
You're sitting at your desk working well and it demands to be picked up. However, keep in mind that they generate callbacks. Procrastination is the inability to begin work. To overcome procrastination, look at its causes. Procrastination is sometimes an expression of burnout.