No, there’s no limit. You can send as many faxes with eFax as you need.
However, depending on your free fax app for iphone and chosen plan, you only get a limited number of sends every month. Once those are exceeded, each send will be charged (currently 10 cents for North America. International rates vary).
With eFax Plus (the lowest-priced plan), you can send and receive up to 170 pages per month. With eFax Pro, the free fax limit is increased to 275 pages per month.
We also offer the eFax Corporate plan, which allows you to set flexible send/receive limits on your faxing app. This is ideal if your business requires a fax service involving dozens of users. To find the best plan for your needs, get started with a free trial account and go from there.