LetterAgent
Mail physical letters by just asking your AI assistant.
Home > Guides > Fax from iPhone
Yes, but not with anything built in: the iPhone has no native fax feature. You scan the pages with your camera and send them through a fax app or a web-based fax service, which transmits them to the recipient's fax number. With LetterAgent, currently in testing, you can ask your AI assistant to send a fax to a US or Canadian fax number: no app download needed.
Here is the part the app icons hide: your iPhone never talks to a fax machine. The app uploads your document to the company's server, and the server sends the fax over a phone line or a fax service on the other end. The iPhone is just a scanner and a remote control. That is why fax apps need an internet connection and why they can send a fax to anywhere, even though your phone has no fax modem and no dial tone involved.
The practical consequence is that scan quality is everything. A fax is a black-and-white image transmission, so a crooked, shadowy phone photo becomes an illegible fax. Lay the page flat in good light, keep the phone parallel to the page, and check the preview before sending. Most fax apps include a scanner mode that straightens and cleans up the image; use it, because a bad scan is the most common reason a fax "didn't go through" when the transmission itself worked fine.
The fax app market has its share of traps, and they cluster around three issues:
| Issue | What happens | How to protect yourself |
|---|---|---|
| "Free" apps with branding | Some free tiers stamp their logo or an ad on your fax pages | Check the fine print before sending anything professional |
| Per-page pricing surprises | Introductory free pages run out, then each page costs more than expected | Read the pricing page, not just the App Store listing |
| Document storage | Your documents sit on the company's servers after sending | Check their privacy policy and delete sent files if the app allows it |
The privacy row deserves emphasis for medical and legal documents. Sending patient records or legal filings through a random free app means your documents live on servers you know nothing about, under policies you did not read. For anything sensitive, use a service with a real privacy policy and a business you can name, and confirm the recipient's fax number before sending: a misdialed fax is one of the classic ways private documents leak.
Yes, through a web-based fax service in Safari. The flow is the same minus the app: scan the pages (the iPhone's Notes app has a built-in document scanner), upload them on the service's website, enter the fax number, and send. Web services are often a better deal for a one-off fax, since you are not installing an app and possibly signing up for a subscription you will forget to cancel. For regular faxing, an app you trust can be more convenient; for the occasional single fax, the browser is the lighter path.
LetterAgent offers faxing, currently in testing. The flow matches the rest of the service: you ask your AI assistant to send a fax, you get a per-fax quote with the page count verified, you approve the exact total, you pay once through Stripe, and the fax is sent. US and Canadian fax numbers only, and there are no inbound faxes. Because fax is in testing with activation in progress, think of it as available in testing rather than a guaranteed send today: the honest description is that it works through the service's testing flow, not that every fax goes out instantly.
If you go this route, the same scan-quality advice applies. And one more tip that holds for every fax method: include a cover sheet. It tells the recipient who the fax is for and how many pages to expect, which is the difference between your fax being routed to the right person and sitting on a shared machine unread.
Ready to fax it? Fax with LetterAgent: describe it to your AI assistant, approve the exact quoted price, and it is sent.
LetterAgent is a working name. Prices include print, postage, and our service fee. US prices in USD, Canadian prices in CAD (Canadian prices exclude applicable sales tax, added at checkout). Currently in private testing.
Need help? Ask your assistant: it can check a job's status any time. If it ever can't handle something: hello@getletteragent.com