Can you guess what the only app on Trump’s iPhone is?

Of course you can, it’s Twitter.

Axios reporter Mike Allen wrote on Thursday that he learned from White House officials that the key to forcing a more disciplined President Trump is limiting his screen time. “In Trump’s case, it’s curtailing his time watching TV and banging out tweets on his iPhone,” he wrote.

Here’s an excerpt from the report:

Trump himself has been pushing staff to give him more free time. But staff does everything it can to load up his schedule to keep him from getting worked up watching cable coverage, which often precipitates his tweets. It has worked well overseas so far.

During last year’s campaign, Trump tweeted from an Android device.

After The New York Times described Trump’s Galaxy S3 phone as an “old, unsecured” device posing a hacking risk because it had not received a security update since 2015, Trump switched to an iPhone this summer.

In terms of security and software updates, iPhone has a distinct advantage over Android.

iOS software updates are immediately available across all supported devices in the wild because carriers don’t get to vet them.

iPhone is also a better pick than older Android devices in terms of security.