The APN that Ufone sends is wrong (I know from personal experience).
Go to settings, Mobile networks and then APN.
Add new:
Name: Ufone 3G
APN: ufone.pinternet
MCC: 410
MNC: 03
APN type: default,supl
Save it. select this APN.
Turn off mobile data, change network mode to 3G. Power off. Power on again after 2 minutes.
You should get H sign, if not, get a replacement SIM card from Ufone.
Sent from my D6503