Thanks for contacting us regarding the "Waiting on network" error you're getting while connected to 4G on your device and downloading from Google Play. It looks like you're experiencing issue #6789539 from our known issues page:
This issue is a problem with the configuration of your carrier network, but we're currently working with carriers to get it resolved. In the meantime, as a temporary workaround, please use 3G instead of 4G to download from Google Play.
Due to a high volume of contacts surrounding this issue, we're not able to keep you updated individually via email - please check our known issues page for updates surrounding this issue.