mregy

Hello, Two years ago, I was offered a fully funded R.A. position for PhD in a university at the US. However, I couldn't travel to start the program at time (I am an international student, and I have already got the F1 visa stampped on my passport). I continued staying at my home country finished my masters and never been to the US. Currently, I am planning to apply for PHD at some other universities. so Do you think that I will need to ask for a release from the university to which I was accepted two years ago ?? Also, do you think it will be possible to get a new F1 visa if I am accepted in some other schools or it is granted only once ?