iPhone 13 Pro Max connectivity issues after iOS update

The first thing to do is Reset your Network Settings. If you have a VPN installed, remove it first.

If you can't connect to Wi-Fi on your iPhone or iPad - Apple Support

Then perform a Force Restart on your phone:

• Press and quickly release Volume Up
• Press and quickly release Volume Down
• Press and HOLD the Side button until the Apple logo appears. It may take up to 15 seconds before you see the Apple logo while holding the side button and if you don't see it, then try again as it may take a couple of attempts to get the speed and sequence of the key presses correct.

If those steps don't resolve the problem, then you will need to perform a Factory Reset using a computer and restore your data from a backup. That is the only way the OS will be re-installed and if you don't have a computer to do that you can take your iPhone to the Apple Store and use one of theirs.

Restore your iPhone, iPad, or iPod to factory settings using a computer - Apple Support

“iPhone 13 Pro Max connectivity issues after iOS update: after recent ios update to 26.4.2 in iphone 13 pro max, i am unable to use wifi, bluetooth and wired earphone.”

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Connectivity Issues After an Update:

Restart your iPhone:

Having recently installed an update, perform a restart. Go here: Restart your iPhone - Apple Support. A restart is a great idea after installing updates, so that it can get with itself, with all configurations being as they should.

I. Troubleshooting iPhone WiFi:

A few thoughts to try:

A. Start Here: If your iPhone, iPad, or iPod Touch won't Connect to a Wi-Fi Network - Apple Support

B. Clear the Temporary Internet Files:

• Cookies perform remembrance of certain site-entered data.
• Cache keeps a snapshot of the last time you visited a site.
• Go Here: Clear the History and Cookies from Safari on your iPhone, iPad, or iPod Touch - Apple Support

C. Restart your Router:

1. Power: off the router
2. Wait: 30 seconds
3. Power: It back on

D. Reconnect to your Network:

1. Go to: Settings
2. Tap: Wi-Fi
3. Disable: Wi-Fi
4. Wait: 30 seconds
5. Enable: Wi-Fi

E. Add Back the Network:

1. Go to: Settings
2. Tap: Wi-Fi
3. Remove: the network
4. Wait: 30 seconds
5. Add: the network back

II. Troubleshooting iPhone Bluetooth:

A. Visit these Links:

• Set Up and Use Bluetooth Accessories on iPhone - Apple Support

• If you can't Connect a Bluetooth Accessory to your iPhone, iPad, or iPod touch - Apple Support

G. Reset All Network Settings to Default:

Example of items that will be reset: (Wi-Fi Passwords, VPN Connections, etc)

1. Go To: Settings
2. Tap: General
3. Tap: Reset
4. Tap: Reset Network Settings.
5. Enter: [Your Passcode]

III. Troubleshooting iPhone Cellular:

Visit these Links:

A. Calls: If you can't Make or Receive Calls on your iPhone - Apple Support

B. Messages: If you can't Send or Receive Messages on your iPhone, iPad, or iPod touch - Apple Support

C. Errors:  If you see a Cellular, Ultra Wideband, or Apple Pay Issue Message after an iOS Update or Restart - Apple Support

D. "No Service": Is "No Service" shown on the top-left corner of your screen? If so, go here to fix this: If you See No Service or Searching on your iPhone or iPad - Apple Support

E. "No SIM": If "No SIM" is shown on the top-left corner of your screen, go here to fix that: If you See 'invalid SIM' or 'no SIM' on your iPhone or iPad - Apple Support

IV. Report this to Apple:

Do your part: Let Apple know what is going on here. Provide them with feedback on this. They may not get back to you directly, but the more feedback they received on this, the more they will know what is going on, and what needs to be fixed in updates to come. Apple will know nothing of you issues, if you don’t report it to them.

1. Go Here: Feedback - iPhone - Apple
2. Comment: that this all began after installing an update, and how you have troubleshot this, thus far. Include the URL of this thread.
3. Select: "Bug Report" for the "Feedback Type"
4. Proceed from there aw necessary