Trump effectively cut Huawei off from Android on May 15, 2019 , when his administration put Huawei on the U.S. Entity List, and Google then began restricting Huawei’s access to Android services and updates on May 19–20, 2019.

What happened

  • The policy move came first: the Trump administration’s May 15, 2019 action restricted U.S. companies from doing business with Huawei without approval.
  • The Google/Android fallout followed right after, with Google announcing it would limit Huawei’s access to Android ecosystem services and future updates.
  • So, if you mean the moment Huawei got cut off in practical terms, the answer is mid-May 2019 , especially May 19, 2019.

Quick context

This did not mean every existing Huawei phone instantly stopped working. The immediate impact was mostly on new devices and future access to Google services and Android updates.

TL;DR

May 15, 2019 was the key Trump administration action, and May 19, 2019 was when Google’s Android restrictions on Huawei became public.