I'm using an Xtouch (Chinese phone) and there's an error '919' when I'm trying to install or download from Android Market. Can you help me?
Yes, I can help you by providing a few tricks to avoid this error:
Clear the cache. Go to Settings > Apps > All > Google Play (Services & Store). Tap on each one and then tap again on Clear Cache. Reboot the phone afterwards.
Change the APN if you connect using your Data connection. Go to Settings > Wireless & Networks > Mobile Network > Access Point Names. Choose another one.
Disable updates. Use the instructions at point 1 and tap on the Uninstall Updates.