Google said basic services would still function on the Android operating system used in Huawei’s smartphones and existing smartphone owners would not lose access to its Google Play app store or security features.

But unless the U.S. Commerce Department grants exceptions, the ban announced last week on all purchases of US technology would badly hurt Huawei, analyst say.

Huawei will likely use its own, stripped-down version of Android, whose basic code is provided free of charge by Google. But it’s not yet clear what other Google software and services — such as maps, Gmail or search — it will be able to use.

There are fears Huawei could miss out on software updates for Google’s Android software — and even lose apps YouTube.