FAQ 简体中文 繁体中文 English

IOS download：

https://apps.apple.com/us/app/id6747240241

Chinese users need to use an account from a non-mainland China app store to download the app.

Make sure 5UF VPN is the latest version from the App Store. Builds 5.3 and newer officially support iOS 16 and later, fixing most cases where the app could not run on iOS 16. If your iPhone or iPad runs iOS 16+, update the app to 5.3 or higher (use the version number shown in the App Store).

More details: iOS client update announcement.

On iOS 15 or earlier, or if the hardware cannot upgrade to iOS 16+, the official app may still be limited. You can:

• Upgrade iOS as far as your device allows, then install or update the official app; or
• Use a third-party VPN client with 5UF where appropriate.

Tutorial: How to use a third-party app with 5UF VPN

If issues remain on 5.3+, contact support with your iOS and app version.

If you are using the latest 5UF VPN app, long-term connection failure is usually uncommon.

If you are on an older iOS release (for example iOS 15 or earlier) or you cannot use the official app on your device, you may hit compatibility or installation limits. Use a third-party VPN client with 5UF and follow this guide: How to use a third-party app with 5UF VPN (tutorial). The reinstall, speed-test, and ticket steps below mainly apply when you can run the official app.

On iOS 16 or later, update the official app to 5.3 or newer from the App Store before the steps below.

If the VPN cannot connect, the Connect button does nothing, or the speed feels slow, use the steps below to check the issue quickly.

1. What if tapping Connect does nothing?

This is usually not caused by the server itself. In most cases, the app was denied VPN permission the first time it asked the system to create the VPN connection.

The fastest solution is to reinstall the app.

• Uninstall the current app
• Install the latest 5UF VPN app again
• When you tap Connect again, allow the system to create the VPN connection

If the first permission request was denied, the system often will not properly trigger the VPN authorization flow again, so reinstalling is usually the fastest and simplest solution.

2. What if the VPN connects but the speed is slow?

The latest app already includes built-in speed testing and app availability checks on the home page, so you can evaluate the current network condition before switching servers blindly.

• You can test latency for servers in different countries from the home page
• In general, a result of under 1 second is considered relatively normal
• After switching to another server, the app can test again so you can compare quickly
• The app also checks availability for major services such as TikTok
• It can also help you identify which service region the current server is closer to, such as Japan or Hong Kong

These tools help you quickly understand whether the problem is caused by the current server, your current network environment, or the service you are trying to use.

3. What if the issue still cannot be solved?

If you already tested and the VPN is still slow, cannot connect, or you are not sure how to judge the result, use the built-in ticket feature in the latest app and contact support directly.

• Open the support ticket section in the latest app
• At the bottom of each ticket page, you will see related action buttons
• Send the test results to support
• Our support team can use your speed test, app availability test, and network diagnostic results to identify the issue faster

The ticket system now supports better email and push notifications, making it easier for us to contact you and solve the issue more quickly.

Recommendation: when you run into a problem, start with the built-in speed test, app availability check, and ticket feedback tools in the latest 5UF VPN app. This is usually faster and more accurate than describing the problem manually.

Adding 5UF to Control Center (iOS – Edit)

The following procedure outlines how to add the 5UF application to your Control Center, enabling immediate VPN activation directly from the system interface.

Step 1 — Access the Control Panel

Swipe downward from the top-right corner of the display to reveal the Control Center.

Step 2 — Enter Edit Mode

Click the edit button on the top right corner of the screen to enter edit mode.

Step 3 — Add the 5UF Control

Select the 5UF application from the available buttons at the bottom of the screen to add it to the control panel.

Completion

Once the control has been added, the 5UF VPN can be activated instantly by tapping the 5UF icon within the control panel.

Adding 5UF to Control Center (iOS – Add Control)

The following procedure outlines how to add the 5UF application to your Control Center, enabling immediate VPN activation directly from the system interface.

Step 1 — Access the Control Panel

Swipe downward from the top-right corner of the display to reveal the Control Center.

Step 2 — Enter Edit Mode

Press and hold any unoccupied area within the control panel, then select “Add a Control” from the options displayed at the bottom of the screen.

Step 3 — Add the 5UF Control

In the search field located at the top of the interface, type “5UF”.
Select the 5UF application from the search results to add it to the control panel.

Completion

Once the control has been added, the 5UF VPN can be activated instantly by tapping the 5UF icon within the control panel.

1. Download the client

IOS currently supports

Sing-box VT:  https://apps.apple.com/us/app/sing-box-vt/id6673731168

Shadowrocket: https://apps.apple.com/us/app/shadowrocket/id932747118

Stash: https://apps.apple.com/us/app/stash-rule-based-proxy/id1596063349

Quantumult X: https://apps.apple.com/us/app/quantumult-x/id1443988620

可以展示订阅的信息，如流量和到期时间

2.使用 Shaowrocket 的截图

点击右上角的“添加”

Sing-Box VT:

Some users notice that the 5UF app seems to use a large share of battery in the iPhone battery report.

In most cases, this is because once VPN is enabled, iOS counts a large part of network activity under the VPN app. It does not necessarily mean the 5UF app itself is consuming abnormal battery.

A simple way to understand it:

• After VPN is enabled, app traffic goes through the VPN tunnel.
• iOS often attributes part of that network activity to the VPN app in battery statistics.
• So a higher percentage does not automatically mean the app itself is using excessive battery.

Under normal usage, you usually do not need to do anything special.

If the battery drain still feels unusually high, try:

• Updating to the latest 5UF app
• Testing again on another network
• Closing unused background apps
• Restarting the phone and checking again

If the issue remains clearly abnormal, contact support and provide your device model, iOS version, and battery screenshot.

Sign in on our website, download the mobile profile, open it on your iOS device, and install the VPN payload when prompted. The Chinese article includes step-by-step illustrations in Safari and Settings.

This guide walks through manual L2TP configuration on Apple mobile devices. L2TP is a legacy option—when possible we recommend the official 5UF app. See the Chinese article for exact field values and screenshots.