If you have wlan use Wlan Calling, than your call is billed like you were in Germany.

Thanks for the reply!

Do I need data balance for my O2 sim? or can I use my home WiFi?

Never use o2 mobile data in India!!! It´s very expensive.
Your home WiFi is free of charge.  Recommendation: Activate Flight Modus and switch WLAN ON to talk via WLAN-calling. 

Hi @alia334, 

welcome to our English Community. Nice to meet you here. 

@Klaus_VoIP and @Denner already gave you some good suggestions what to do. Thanks a lot! 

We do not offer special rates for calls from India to Germany. 

Just have a look here: https://www.o2online.de/service/ausland-roaming/ India belongs to Zone 4

Were the suggestions already helpful for you? Then mark the best answer as solution (Lösung). 

Loving greetings,

Tobias

Thanks for the suggestion. By ‘activate Fight Modus’, did you mean to turn on ‘Flight Mode’? 

Wouldn’t I need an active prepaid taife/plan on my sim to make the call(after turning on the WLAN calling option)?

correct - symbol of a airplane 

correct - a active SIM and a tarif plan (prepaid or postpaid) is required.

correct - In addition, WiFi calling must also be activated in the telephony app.

Hello @alia334,

how does it look like? Did everything work as planned and were you able to make your call via a wifi connection? :-)

Regards,

Lars