It has been almost two weeks since President Donald Trump has tweeted from his unsecured Android device, which may indicate that he has switched to a secure device full time.

Since March 8, all of the President’s tweets have come from an iPhone rather than his favored Android phone. Previously, it was believed that tweets from an iPhone were from Trump’s aides while tweets from an Android device were directly from the President.

Read: President Uses Old Android Phone For Tweeting, Raising Security Concerns

Tweets coming from Trump’s account haven’t been any less inflammatory since dropping Android, which suggests he’s either using an iPhone as his primary device or is dictating his tweets to a staffer who is tweeting from an iPhone.

The President has typically done his tweeting from a Samsung Galaxy S3, a handset first released in 2012. The smartphone is not capable of running the most recent version of the Android operating system and has not received a software update since 2014.

Trump used the Galaxy S3 throughout his time as President-elect and into his first months in the White House. It has been suggested he may have taken calls with world leaders on an unsecured line prior to his inauguration.

Trump’s ongoing use of an unsecured Android smartphone has led to much consternation from security experts who worried the device could be compromised.

An unsecure device in the hands of a world leader is a likely target for any malicious actor. The smartphone could be hacked from any person connected to the same unsecure Wi-Fi network as the device. Recent reports of cell networks in the D.C. area potentially being hacked by a foreign actor raises further worries that communications from a device like the President’s Android are at risk.

Read: D.C. Cell Network May Have Been Hacked, Used To Monitor Calls

Trump was reportedly given a secure handset upon taking office —one similar to the locked down mobile device provided to President Barack Obama, the first U.S. President to be given a secured smartphone.

President Obama was provided a modified iPhone that allowed him to place calls, check emails, browse the internet and read the news, but had many of its features restricted. "For security reasons—this is a great phone, state-of-the-art—but it doesn't take pictures, you can't text, the phone doesn't work, you can't play your music on it," Obama said of the device during an appearance on the Tonight Show Starring Jimmy Fallon in 2016.