iPhone 12 Pro Max iP12 Pro Max/Dual Sim/International Travel/Wifi Calling Question

[whadzinaname]

I have an iPhone 12 Pro Max with T-Mobile on the the eSIM. I will be traveling to India soon and the T-Mobile roaming partner in the city I will be in is very bad and buying the $50 Roaming/Data package doesn't work. So, I have a local SIM card with a good data package with a reliable provider.

If I use the local SIM for data and if I enable Wifi calling on the primary T-Mobile line, will the primary T-Mobile line be able to use the data from the local SIM and work via Wifi Calling everywhere I go without being attached to a Wifi hotspot for calling back to the US?

Thanks in advance.

 

[EDH667]

I have an iPhone 12 Pro Max with T-Mobile on the the eSIM. I will be traveling to India soon and the T-Mobile roaming partner in the city I will be in is very bad and buying the $50 Roaming/Data package doesn't work. So, I have a local SIM card with a good data package with a reliable provider.

If I use the local SIM for data and if I enable Wifi calling on the primary T-Mobile line, will the primary T-Mobile line be able to use the data from the local SIM and work via Wifi Calling everywhere I go without being attached to a Wifi hotspot for calling back to the US?

Thanks in advance.

Wi-Fi calling only works when you are on a Wi-Fi connection. The local SIM would be providing a cellular connection, so you would need to be connected to a Wi-Fi hotspot for calling back to the US.

 

[MacInTO]

I have an iPhone 12 Pro Max with T-Mobile on the the eSIM. I will be traveling to India soon and the T-Mobile roaming partner in the city I will be in is very bad and buying the $50 Roaming/Data package doesn't work. So, I have a local SIM card with a good data package with a reliable provider.

If I use the local SIM for data and if I enable Wifi calling on the primary T-Mobile line, will the primary T-Mobile line be able to use the data from the local SIM and work via Wifi Calling everywhere I go without being attached to a Wifi hotspot for calling back to the US?

Thanks in advance.

Hi, did you try this? If so does it work?

 

[kevink2]

I think I've read of using a second SIM for data and being able to make calls from the other number. Similar to Wi-Fi calling.

 

[MacInTO]

I think I've read of using a second SIM for data and being able to make calls from the other number. Similar to Wi-Fi calling.

Yes, this is what I'm wondering. If I am outside of the US and my prepaid T-Mobile SIM is on wifi calling with data off and my second SIM with local data is on, will I be able to use my T-Mobile line without roaming charges?

 

[Neil Robertson]

I have an iPhone 12 Pro Max with T-Mobile on the the eSIM. I will be traveling to India soon and the T-Mobile roaming partner in the city I will be in is very bad and buying the $50 Roaming/Data package doesn't work. So, I have a local SIM card with a good data package with a reliable provider.

If I use the local SIM for data and if I enable Wifi calling on the primary T-Mobile line, will the primary T-Mobile line be able to use the data from the local SIM and work via Wifi Calling everywhere I go without being attached to a Wifi hotspot for calling back to the US?

Thanks in advance.

I was reading about this for an upcoming trip. According to this Reddit post the answer seems to be 'yes':

https://www.reddit.com/r/ATT/comments/f03ugc

Since T-Mobile will automatically turn on "free roaming" when you enter a different country, you may need to contact T-Mobile to get them to turn roaming off.