Hi, what kind of limits are you concerned about? Firefox browsers use your device's regular data connection, so as long as you have a connection, you can use Firefox. From time to time, you might find that Firefox warns you not to visit a site because of a phishing or malware risk, but there is still usually a link to continue if you want. On the other hand, if you are trying to visit a secure site and Firefox can't verify the site's certificate or it uses weak encryption, then Firefox might not be able or willing to connect. You can compare another browser on your device in that case to see whether it is a Firefox problem or a site problem.