Hello,
To test your Internet connection:
- Enter to Settings -> More Networks -> Mobile Networks
- Network Mode Press and then select "3G Only"
- OK and exit.
- Try as you will, if it works, I recommend using only 3G to connect, not so bad.
For voice control test:
- Enter to Settings -> Accessibility
- Deactivate the option "TalkBack"
- Rewind
- Press "Vision"
- Press "Options Text to Speech" and deactivated.
Tell us how it went.