I contacted to the potential supervisor and got his reply after 3 days, saying that he is available to be my supervisor. Then, I contacted him again whether he would like to have meeting with me (which is part of admission process) or proceed the formal application. Now after 1 week, I didn't receive any of his reply. Should I send follow up mail or call him?
After waiting for on week, it seems reasonable to write another friendly reminder email to him. Calling might be an option but you may not succeed if he is currently out of office. Therefore I would rather write an email.