It is possible to have a third otoplasty. However, it would depend on a physical exam. It would be helpful to see a side view of your ear. Best of luck.
To properly answer your question, physical examination by a board certified plastic surgeon or facial plastic surgeon is recommended. Following examination and review of the operative reports, further recommendations may be made to discuss how to best fix the "telephone effect" you do not like.
It depends on whether you were operated on with one of the traditional methods or with the stitch method. If you were operated on with one of the traditional methods and not too much cartilage was removed, then a further operation is possible. If you were operated on with the stitch method, whereby no cartilage was removed, there would be no problem in having another operation.
Definitely a proper examination is required to answer your question, at least all photo profiles. Generally speaking almost all otoplasty can be revised and get a significant improvement. Find a Board Certified Plastic Surgeon with experience in otoplasty and discuss what you can really expect, if Revised.
Dr. Luis Redondo
Your question cannot be answered without an examination. You may wish to consult several reputable facial plastic surgeons, with your operative reports, so you could see what might be best for you.
Hope this helps you.