I’m adding 5G network slicing support to a web browser app using WKWebView. The app declares: com.apple.developer.networking.slicing.appcategory: webBrowser-9003 com.apple.developer.networking.slicing.trafficcategory: defaultslice-1 The documentation says that apps should also set networkServiceType on URLRequest or URLSessionConfiguration. However, most requests made by a WKWebView, including subresources, JavaScript fetches, and WebSockets, are created internally by WebKit. Is declaring webBrowser-9003 and defaultslice-1 sufficient for WKWebView traffic, or is there a supported way to configure the network service type for the entire WKWebView network session?

Hello, I am writing a NetworkExtension VPN using custom protocol and our client would like to able to use 5G network slice on the VPN, is this possible at all? From Apple's documentation, I found the following statement: If both network slicing and VPN are configured for an app or device, the VPN connection takes precedence over the network slice, rendering the network slice unused. Is it possible to assign a network slice on a NetworkExtension-based VPN and let the VPN traffic uses the assign network slice? Many thanks

I am developing a VoIP application that uses NetworkExtension (Local PUSH function) And VoIP(APNs) PUSH. Since iPhone X, iPhones have supported eSIM, allowing for the simultaneous use of a physical SIM and an eSIM. Consequently, users of our VoIP app have requested the ability to lock the network used by the VoIP app to either the eSIM or the physical SIM. Our VoIP app utilizes the network through the socket API. Is there an API in the iOS SDK to lock the network used via sockets to either the eSIM or the physical SIM? In other words, we would like to be able to retrieve the IP address assigned to the eSIM or the physical SIM in advance, and know which IP address is assigned to which SIM. Are there any such APIs available (that are not "Deprecated")

We are currently working on deploying a Java Card applet onto the eSIM (eUICC) inside an iPhone. According to the GSMA SGP specifications, the eUICC is expected to support Java Card 3.0.5 Classic Edition. As defined in the Java Card 3.0.5 specification, the javacardx.crypto package should support standard algorithms including MessageDigest.ALG_HMAC_SHA_512. However, during our testing on the iPhone's embedded eSIM, we found that ALG_HMAC_SHA_512 appears to be unsupported or disabled. The same applet functions correctly on external Java Card platforms that support Java Card 3.0.5, leading us to believe that this is a restriction specific to the iPhone’s eUICC implementation. Our main questions are: Why is ALG_HMAC_SHA_512, which is part of the standard Java Card 3.0.5 specification, not available on the iPhone eSIM? Has Apple imposed any internal restrictions or exclusions on certain crypto algorithms for security, performance, or compliance reasons? Is there a list or documentation of supported and unsupported Java Card APIs or algorithms on the eUICC used in iPhones? Any insights from Apple engineers or other developers with experience on this topic would be greatly appreciated. Thank you in advance!

Hello, I am in a very similar situation as described in the thread: https://developer.apple.com/forums/thread/655183 Context: I am working on an app that receives data from a hardware device through its Wifi network, and the hardware is not connected to the internet. Now, I would need to call some API while still connected to hardware so I would need to use the cellular data. As mentioned on the thread, I can achieve this via Network framework, using the requiredInterfaceType property. But Is there any other way I can achieve this? I can also do some suggestion on the hardware if that's helpful. Thank you!

We found that when we only set one App Category and one Traffic Category in Xcode entitlements, the built application will contain all App Categories and Traffic Categories in the embedded.mobileprovision file, is it expected? Entitlements file: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>com.apple.developer.networking.slicing.appcategory</key> <array> <string>streaming-9001</string> </array> <key>com.apple.developer.networking.slicing.trafficcategory</key> <array> <string>avstreaming-7</string> </array> </dict> </plist> embedded.mobileprovision: <key>Entitlements</key> <dict> <key>com.apple.developer.networking.slicing.appcategory</key> <array> <string>communication-9000</string> <string>games-6014</string> <string>streaming-9001</string> </array> <key>com.apple.developer.networking.slicing.trafficcategory</key> <array> <string>defaultslice-1</string> <string>video-2</string> <string>background-3</string> <string>voice-4</string> <string>callsignaling-5</string> <string>responsivedata-6</string> <string>avstreaming-7</string> <string>responsiveav-8</string> </array>

It seems currently 5G Network Slicing is only available on URL Request / URL Session / Low level network and not on AVPlayer, is it possible to have the app using default slice when start the app and only enable Network Slicing when streaming video via AVPlayer?

I tried configuring the preferredForwardBufferDuration on devices using 4G and Wi-Fi, and in these cases, AVPlayer works correctly according to the configured buffer duration. However, when the device is connected to a 5G network, the configuration value no longer works. For example, if I set preferredForwardBufferDuration to 30 seconds, AVPlayer preloads with a buffer of over 100 seconds. I’m not sure how to resolve this, as it’s causing issues with my system.

Hi, I have been using iPhones 14Pro, 15Pro for the last couple of years for 5G SA research applications. As far as the iPhone14 Pro goes, even with the latest upgrade 18.2 beta 2 it works flawlessly, upon inserting the SIM CARD, I can activate VoLTE and then there is a toggle that enables 5G SA. The phone connects to the network using PLMN 001 01 and functions perfectly. iPhone 15 Pro is behaving completely different. Upon inserting the SIMCARD it also lets enabling the 5G SA functionality but the phone never searches for a cell. Even putting the phone into mobile field test, it never searches for NR even with the same SIM card working in the 14 PRO. This particular mobile phone did work in the first iOS versions and stopped working after upgrading to 18.1. Just a few days ago, I bought a 16 PRO to try it with our 5G SA networks, and it is behaving the exact same way as the iPhone 15 PRO. It never tries to attach to the 5G SA even with the same SIM card as the 14PRO. I would like to understand this difference in behaviour across all these devices and understand if this is a new implementation or a SW bug. In the case this is a new implementation, please point me towards novel documentation so I can understand what to change in the network configurations to have the communication back. Thanks.

What are the possible KPI requirements set by Apple AI for cellular networks, e.g. regarding latency, throughput or jitter? What is the expected effect on iPhone energy consumption?

after updating to the ios 18 this morning, i came across an issue where it completely cut off my cellular data and i can't get it back. i tried all the 'solutions' that worked with me before with this issue on past updates -- taking the sim card out, resetting, airplane mode, Finder App to see any updates, but there's nothing. i have enough storage as well. before updating, my cellular data was completely fine and okay, my phone is in good condition as well. now i can't use my phone because after the update it cut off my cellular data and i do not know what to do. any help???

Since ios 18 Beta 4 my celluar connection is unstable. Dropping from full service to none at all. Or just showing Edge speed. Same issues with my eSim as well. Funny thing. Sometimes my eSim has full reception and my regular Sim none at all. Ok. no Internet services anyhow. Was not solved in the iOS 18 Beta 4 rerelase on Saturday. Filed a feedback as FB14486702

We are Telecom company and we are already registered in GSMA We have started testing our product environment and everything has been working smoothly with Android handsets. However, we are facing some challenges with iPhone handsets. We only use IPV6 for UE addresses allocation and we are seeking your support and guidance on how to register our MVNO MCC and MNC in the iPhone carrier file. Your assistance in this matter would be greatly appreciated.

There is new porperty introduced in iOS 18 Beta for VPN i.e CellularSliceUUID But there is no description available for the same. Could you please let us know how this property can impact VPN? https://developer.apple.com/documentation/devicemanagement/vpn?changes=latest_major&language=objc

Initially, my task was to determine which type of connection is being used at the moment: 5G or 4G. And I found "CTTelephonyNetworkInfo().serviceCurrentRadioAccessTechnology" but there is a problem when the device has more than one sim. My iPhone has two sims, one physical and one electronic. I need to determine which one is used to access the network. I tried to use "CTTelephonyNetworkInfo().serviceCurrentRadioAccessTechnology" but it is a dictionary [String: String] that only indicates the connection of each of the cards, and it is not possible to find out which one is active from this dictionary. So how can I determine which of the two cards are currently being used to access the Internet?

I am currently developing two iOS applications that require peer-to-peer connectivity. To facilitate this, I've implemented NWListener and NWConnection in both apps for network communication. To determine each device's public IP address and port—necessary for establishing a connection over the internet through my mobile operator's Carrier-Grade NAT (CGNAT)—I'm using a STUN server. Despite successfully retrieving the external IP addresses and ports for both devices, I am unable to establish a peer-to-peer connection between them. My current setup involves initiating a connection using the public addresses and ports discovered through the STUN server response. However, all attempts to connect the devices directly have been unsuccessful. I am seeking guidance on whether there are additional considerations or specific configurations needed when using NWListener, NWConnection, and a STUN server to establish a direct connection between devices in a CGNAT environment. Is there a particular step or network configuration I might be missing to successfully connect both iOS devices to each other using their external network details?

I'm developing an iOS app for video playback using the external library vlc-ios, Prior to iOS17, I was able to achieve streaming playback of mp4 files hosted on a server using the vlc-ios librarys's HTTP POST method. However, after iOS17, this streaming playback no longer functions. Upon inspecting the logs, there were no traces of vlc-ios receiving data from iPhone device. Does anyone know the cause of this issue? Additionally, the occurrence condition is when the environment is iOS17 and the sim's 5G communication is enabled.

Hi, All. Does anybody can help me, please? I have read "Optimize your app for 5G" by Apple from June 10 2021 and watched WWDC21 video "Optimize for 5G networks", but wasn't been able to find answers for questions that interesting for me: 5G Slicing Is iOS having any API for "5G Slicing" or support it somehow? Especially, interested in "Prioritise Low-Latency" feature of "5G Slicing". Can application send data using "low-latency" slice? Gaming, ARKit, CoreML, SceneKit In mentioned article - it's nothing about how to finally optimise it for gaming. No any examples and no any useful information related to highlighted frameworks.. is "5G optimisation" possible to do in case of WKWebView usage? By my requirements, I need to use "5G Slicing" with low-latency in our gaming application. In Android it having network capability "low-latency"(NET_CAPABILITY_PRIORITIZE_LATENCY). Is iOS having something similar? Thanks all in advance for anyone who can help somehow. Best regards, Eugene.

Hi, has anyone been able to make to work the new geofence Item under Object CellularPrivateNetwork Object, I was able to create the mobileconfig file and install it on the a Iphone 13 with iOS 17 Beta 7 without error but looks like the geofence is not actually working at all, since the properties of the object are not reflecting at all on the actual operation of the phone, specifically CellularDataPreferred and CellularPrivateNetwork.GeofenceItem any guidance on this would be greatly appreciated, thanks!

The device releases the AP hotspot, and the iPhone connects to the hotspot to send upd data communication. Use the T-mobile SIM card 5G to enable the cellular network to send upd data, but the device cannot receive UPD data. It takes about 1 minute to receive after repeated sending; It is normal for the same program to use China Mobile 5G/4G cellular data or turn off the cellular network; How to solve the problem that T-mobile SIM card 5G UC cellular data limit udp data sending?