# Wi-Fi Assist on iPhone: How It Works

URL: https://byshahid.com/blog/wi-fi-assist-iphone/
App: Secret Codes: IMEI & Carrier (https://apps.apple.com/us/app/secret-codes-imei-carrier/id6807154322)
Author: Muhammad Shahid
Updated: 2026-11-04

> Fall back to cellular when Wi-Fi goes bad. When a Wi-Fi connection is connected but not actually working, Wi-Fi Assist switches to cellular data instead of leaving you stalled. It is on by default. The trade-off is data use — if you are consistently over your allowance, turning it off is worth trying.

- **What it does:** Fall back to cellular when Wi-Fi goes bad.
- **Published for:** any iPhone
- **Type:** iOS setting

Fall back to cellular when Wi-Fi goes bad. This page explains what it does, how to use it on an iPhone and which carriers it applies to.

I build **Secret Codes: IMEI & Carrier**, a free iPhone app with 317 checked codes and guides, including this one. If you would rather tap than memorise, [get Secret Codes on the App Store](https://apps.apple.com/us/app/secret-codes-imei-carrier/id6807154322).

## What is Wi-Fi Assist?

When a Wi-Fi connection is connected but not actually working, Wi-Fi Assist switches to cellular data instead of leaving you stalled. It is on by default.

The trade-off is data use — if you are consistently over your allowance, turning it off is worth trying.

## How do I do it?

- Open the Settings app.
- Tap Cellular.
- Scroll to the very bottom of the page.
- Turn Wi-Fi Assist on or off.

## Which carriers does this apply to?

| Published for | any iPhone |

| Type | iOS setting |

| Good to know | Available on every iPhone. Off by default only on some carrier configurations. |

_Screenshot: The Secret Codes detail screen shows the steps, the carriers and an Open in Phone button._

## Related iphone calling features

- [Allow Calls During Focus](/blog/allow-calls-during-focus-iphone/)
- [Merge Calls Into A Conference](/blog/merge-calls-into-a-conference-iphone/)
- [Dial Assist](/blog/dial-assist-iphone/)
- [Clear Your Recent Calls](/blog/clear-your-recent-calls-iphone/)
- [RTT and TTY](/blog/rtt-and-tty-iphone/)
- [Review Device Analytics](/blog/review-device-analytics-iphone/)

See all [iphone calling features](/blog/iphone-codes/iphone-features/) or [every category of iPhone codes](/blog/iphone-codes/).

## How Secret Codes helps

Secret Codes keeps this and every other entry a search away. Pick your carrier once and each entry says whether it is published for your line. You can save favourites, add a private note, and record whether a code worked on your line.

**Secret Codes: IMEI & Carrier** is free on the App Store: https://apps.apple.com/us/app/secret-codes-imei-carrier/id6807154322

## FAQ

### What is Wi-Fi Assist on iPhone?

Fall back to cellular when Wi-Fi goes bad. When a Wi-Fi connection is connected but not actually working, Wi-Fi Assist switches to cellular data instead of leaving you stalled. It is on by default.

### What else should I know about Wi-Fi Assist?

The trade-off is data use — if you are consistently over your allowance, turning it off is worth trying.

### What are the steps for Wi-Fi Assist?

1. Open the Settings app. 2. Tap Cellular. 3. Scroll to the very bottom of the page. 4. Turn Wi-Fi Assist on or off.

### Where do I find Wi-Fi Assist?

In the Settings app on your iPhone.

### Is there a dial code for Wi-Fi Assist?

No. On iPhone this is not a dial code, so you use the steps on this page instead.

### Which carriers does Wi-Fi Assist work on?

It is published for any iPhone. Available on every iPhone. Off by default only on some carrier configurations.

### Does Wi-Fi Assist work on Android phones too?

These steps are for iPhone. Android phones have their own menus.

### Will Wi-Fi Assist work outside the US?

The iPhone steps stay the same, although some features depend on your carrier and region.

### What if Wi-Fi Assist does not work on my iPhone?

Check that it applies to your carrier first, because carriers decide which services they offer and can change them. If it should apply to your line, contact your carrier.

### What is related to Wi-Fi Assist?

Allow Calls During Focus. Decide who can still get through while you're heads-down.

### What else is in this category?

Merge Calls Into A Conference. Combine several calls into one conversation.

### Can I find Wi-Fi Assist in an app?

Yes. Secret Codes, a free iPhone app, includes it with its steps and carrier details.

## Sources

- [Apple Support: iPhone User Guide](https://support.apple.com/guide/iphone/welcome/ios)