Hi, Welcome to health care magic, This is a very common problem and unfortunately, there’s no medication for the same. It is quite possible that you get ejaculated within few minutes with telephonic sex but that does not mean you will have premature ejeculation during sexual intercourse. The commonest cause of premature ejaculation is the anxiety of performance. A behavioural technique such as squeeze-pause technique, desensitizing creams and SRRI (selective serotonin reuptake inhibitors) are few common treatments useful in premature ejaculation. You should take consultation with a sex therapist, psychologist, or psychiatrist to be assessed properly. Regards.