Also, some nations may provide mobile applications that streamline this procedure, making it even simpler for candidates to verify availability while on the go. Many passport stake apkoffices have dedicated phone lines where applicants can call to check the availability of slots in addition to their online resources. Different Approaches & Advice. This approach might not be as effective as checking online, but it might be helpful if you have specific questions about your application or if you have trouble navigating the website.