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How to check if iPhone has 5G Standalone turned on and is working in iOS 16.4

Included with the new features and changes in iOS 16.4 is the capability for iPhone to use T-Mobile’s 5G Standalone coverage in the US and with Vivo and Claro in Brazil. The new option can offer speeds as fast speeds as 3.3Gbps using the power of carrier aggregation. Here’s how to make sure 5G Standalone is turned on with iPhone and how to verify your cellular connection stats.

T-Mobile officially launched its Ultra Capacity 5G SA network in November last year, touting speeds up to 3Gbps. However, only flagship Samsung smartphones were able to take advantage of the latest network advancement at first with T-Mobile saying that it would “expand to additional devices in the near future.”

Now with iOS 16.4, we’ve seen the toggle arrive in iPhone Settings to enable the super-fast speeds. 5G SA should be enabled by default for T-Mobile customers in the US – the Uncarrier is the only stateside provider for now with 5G SA. Claro and Vivo are also showing 5G SA functionality with iPhone in Brazil. Meanwhile, this flavor of 5G has previously been available on iPhone in other countries.

As a refresher, T-Mobile says its Ultra Capacity 5G SA + carrier aggregation allows it to achieve 3Gbps speeds by merging multiple channels of mid-band 5G spectrum. Also, it’s unclear exactly which cities 5G SA is accessible through T-Mobile for now, so you need to just test it out to see.

How to make sure 5G Standalone (SA) is turned on with iPhone

Only iPhones connected to a carrier with 5G SA will see the option available in Settings

  1. Running iOS 16.4, open the Settings app
  2. Choose Cellular
  3. Now tap Cellular Data Options then Voice & Data
  4. At the bottom, make sure the 5G Standalone toggle is turned on

Check your 5G SA connection stats

  • After you make sure 5G Standalone is turned on, you can run a speed test to see what performance you’re getting
  • You can dial 3001#12345# and hit call to enter Field Test mode – this will provide specific details about your 5G connection and whether or not you’re getting Standalone service
  • Look for SA next to connection_type
  • Keep in mind while 3.3Gbps has been achieved in T-Mobile tests, real-world performance will vary
5G Standalone turned on iPhone 1

Are you seeing 5G SA with T-Mobile on your iPhone with iOS 16.4? What speeds are you getting? Share your experience in the comments!

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Avatar for Michael Potuck Michael Potuck

Michael is an editor for 9to5Mac. Since joining in 2016 he has written more than 3,000 articles including breaking news, reviews, and detailed comparisons and tutorials.