For millions of people in the US who use the Chinese app WeChat, it's a lifeline to friends, family, customers and business contacts in China.
That lifeline is now under attack by an executive order from President Donald Trump that could ban the app in the US as early as mid-September, potentially severing vital relationships.
It's the first thing I check in the morning, Sha Zhu, a Chinese-American in Washington, says of WeChat.
It's how she talks to her mother and old friends from China, which she left in 2008, and how she communicates with her colleagues as a public relations manager for a Chinese-owned consulting company. It's where she stores the Chinese currency in her virtual wallet.
Most important, it's where she keeps videos and audio clips of her father, who died four years ago.
In China, WeChat, or Weixin as it's known, is critical infrastructure texting, social media, cab-hailing, payments and more, all wrapped into one app. Many Chinese businesses don't even take credit cards anymore, just WeChat.
It has over a billion users, owner Tencent says, mostly in China. Mobile app firms have varying estimates for US downloads in the range of 19 to 26 million.
People in China have little choice but to use it because the country's communist rulers block access to Google's search engine, Facebook, Twitter and other social media, along with many other foreign websites and online services.
For people in the US, WeChat has less functionality than it does in China.
But, it's what connects immigrants and students from China to their pasts and to each other.
Chinese restaurants in the US use it to take food orders. Businesspeople in the US that have work in China rely on it as well.
Kurt Braybrook, who spent 22 years doing business in Shanghai before moving back to the US in 2017, says the app is irreplaceable for him and his China-born wife.
He could lose roughly 500 WeChat contacts, few of which he could reach without the app.
If they banned it entirely, it will wipe out connections to my wife's family, all our friends and my network of business contacts I built over 22 years, says Braybrook, who now lives in Grand Rapids, Michigan.
Trump's August 6 order, released after hours without additional explanation, purportedly aims to ban all transactions related to WeChat."
Trump simultaneously issued a nearly identical order aimed at the popular, Chinese-owned video app TikTok.
Both orders have thrown users into confusion, leading some to begin moving to alternative services. But that's especially difficult for regular users of WeChat.
Executives of more than a dozen US multinationals pushed back against the Trump order on WeChat in a conference call with White House officials, the Wall Street Journal reported Thursday.
Some feared the order might prevent their subsidiaries in China from using the app, which could place them at a competitive disadvantage.
The day after Trump's order, Zhu got dozens of queries from friends, family members and colleagues, asking if they should switch to messaging options such as Telegram, WhatsApp or Signal.
Those offer secure messaging and aren't Chinese-owned.
She still doesn't know if she'll be able to access her money, or what she'll do with all those stored memories of her father.
We can't make a plan, she says. She blames politicians, especially Trump, for her current stress: We're the pawn that they can manipulate to put anywhere on the chessboard.
