Thank you NewRoot1 for the reply. I went to the network shop and they gave me a new setting for APN. That’s it. Back to normal again. Now that the phone is behaving I can share the experience. I got the phone from Taobao online store. The phone came unlocked and unrooted as I asked. The shop also got rid of Chinese stock apps. All I was missing was google apps, particularly google play.
I found this
But the root access was gone when I was deleting more stock apps.
So I started from the beginning and installed the recovery again with “recovery22.214.171.124_AscendG330D.exe” from here
I downloaded the exe file to PC. Then I installed Java and android SDK to the PC. Download and run the “Handset WinDriver.exe” on the PC from here
Switch the phone to fastboot mode (vol DOWN and power buttons). The phone would freeze at wo logo. Connect the phone to PC.
Then I double-click the “recovery126.96.36.199_AscendG330D.exe” file on PC, follow the instruction (just press any key on the first screen and same on the second screen), and get recovery. Disconnect the phone from PC.
Then place “Root Recovery.zip” in the SD card. Put the card in the phone and boot the phone to recovery mode (vol UP and power buttons).
Choose update from SD and pick the recovery zip and flash. Reboot and get root.
Repeat the procedure this time with the gapps in the SD card. Get google Play.