Share your experience!
Hi @Ahmed0, welcome to our forum!
I am sorry to hear about that. 
Have you been able to connect to your service providers 3G network previously with the your phone and the same SIM card?
If you have, I would recommend that you try with another SIM card in your phone.
You can also run a scan for your service providers 3G network in Settings > More > Mobile networks > Network providers. When the search is done your service providers 3G network will be marked with a little house icon > tap on it and it should register on the network.
Let me know how it went!