Without Google Play Services, Huawei would have to build these tools itself or leave developers to do it. The company has created its own version of some of these features — like a push notification service — but developers still have to add support for Huawei’s version of the tools to their apps in order for them to work on non-Google phones. Huawei is building its own app store alternative, but it could take a long time to build everything else that developers and users are accustomed to getting from Google.