Update Sep 16th, 00:53 AM: The issue has been fixed with instructions here. The original story below has not been modified.

T-Mobile is urging all customers using an iPhone 6, iPhone 6 Plus, or iPhone SE to hold off on installing iOS 10 for now. On Twitter, the company and its top executives including CEO John Legere have warned against installing Apple's latest big update. The three iPhone models are reportedly losing connection to T-Mobile's network; several employees at The Verge have experienced the issue over the last two days. These are massively popular phones we're talking about, so it's no small inconvenience for customers.

Once the connection is lost, it isn't restored unless users power down their iPhone and restart it. That's the "temp fix" offered by T-Mobile VP Neville Ray, who tweeted confirmation that Apple is aware of the major bug and working on a fix. That's expected to arrive within the next 24 to 48 hours, according to the company.

It's an embarrassing glitch that comes at an inopportune time for both parties; Apple experienced problems during the first hour of iOS 10's launch on Tuesday, and T-Mobile recently kicked off its new T-Mobile One unlimited plan. A phone that can't access the network isn't a great way to showcase those Uncarrier benefits like unlimited music and video streaming.