There’s a lot you can do online when it comes to immigration services. For example, there are certain forms you can submit online, including the I-90, I-130, N-400, N-565, and N-600. (The complete list is available here.) Besides submitting your application, you can also pay the immigrant fee online.
If you’re submitting a form that has variable fees, you can find that with the online calculator. And, if you haven’t received correspondence related to your case, you can ask for it by sending an e-request.
The USCIS Contact Center is another option you have if you can’t find information online or need assistance with your appointment. To get in touch with a representative, use 800-375-5283 if you’re in the US. This help is available from 8:00 AM to 8:00 PM EST but with the same number, you can use the 24/7 automated service.