Galaxy tab S7+ VOLTE

[AndrewV1]

Hi community, I have a Samsung Galaxy Tab S7+ 5g bought from Telstra in 2021. It is capable of making and receiving calls using VOLTE and WIFI calling ONLY when using a Telstra (or Telstra MVNO) sim card. As soon as I put a Vodafone card in, I can no longer make or receive calls. As soon as I put an Optus sim card in, I can make and receive calls, but ONLY on the 3G network (no VOLTE or WIFI calling). ALL sim cards (Telstra, Vodafone & Optus) work using VOLTE & WIFI calling in my old Samsung Galaxy Tab A7 (2017). and in my iPhone 13.

This tells me that Telstra have installed something on my Galaxy Tab S7+ 5G that restricts VOLTE & WIFI calling to their network. This tablet works perfectly for data on all 3 networks, so I know that the device is not locked.

Telstra are not helping and the official Samsung support keeps asking for error reports, which I have sent.

Can anybody help?

[HJ_E]

Hi Andrew,

Question: What is the Model number of your Tab?

[AndrewV1]

Hi, it is SM T976B

[HJ_E]

As far as I know, the only way to make your device carrier independent is to install unbranded firmware on it. For Australia the CSC needs to be XSA. (As opposed to TEL for Telstra firmware, for example)

The bad news is that flashing new firmware on your phone or tab, does have some risk to it.
The good news is: The XSA firmware is available for your tab (SM-T976B), here >>
https://samfw.com/firmware/SM-T976B/XSA

If you want to go ahead with flashing these files on your tab, you can have a look at the instructions on this page >>
https://eu.community.samsung.com/t5/other-galaxy-s-series/unable-to-find-the-option-of-volte/td-p/94...