You'll need to ensure that your add-ons in self-serve has “International Voice Roaming” enabled. Then you can restart your phone and it should connect to a network. If not, go into your network selection settings and see what populates for networks to connect to.

Thanks. After doing the above steps, I can see the signal on my phone. But still, it says “Emergency Calls Only” in the top left corner. 

Please help!

Did you go into your network settings to change your network from automatic to manual to see what networks populate like Goran mentioned? 

Did you reboot the phone?