cancel
Showing results for 
Search instead for 
Did you mean: 

Wifi Calling

Sinkers
Level 1: Joiner
  • 11 Posts
  • 3 Topics
  • 0 Solutions
Registered:

Hi,

 

I am thinking about purchasing a used Galaxy S9 plus.

 

Having poor reception at home, I need to have wifi calling working.

 

I had to replace my previous (unlocked from Vodafone) Galaxy S7 Edge and had to get an O2 Galaxy S7 Edge to get wifi calling working.

 

Have things changed, or will I need an O2 version of the Galaxy S9 Plus to get wifi calling working or would any unlocked S9 Plus work?

 

Thanks

 

 

Message 1 of 14
6,667 Views
1 ACCEPTED SOLUTION

Accepted Solutions

MI5
Level 94: Supreme
  • 122155 Posts
  • 609 Topics
  • 18946 Solutions
Registered:

@Sinkers wifi calling will work on any S9 regardless of firmware.

I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.

Currently using:
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)

View solution in original post

Message 6 of 14
6,540 Views
13 REPLIES 13

Cleoriff
Level 94: Supreme
  • 106279 Posts
  • 790 Topics
  • 5478 Solutions
Registered:

Hi @Sinkers 

To get 4G and WiFi calling your phone should be running O2 firmware. So if you buy from O2 you will be fine.

Info in this link

https://www.o2.co.uk/business/support/network-support/wifi-and-4g-calling#Samsung-set-up

*The Game Is On*

Girl in a jacket
Message 2 of 14
6,552 Views

Sinkers
  • 11 Posts
  • 3 Topics
  • 0 Solutions
Registered:

Thanks for your quick reply.

 

I guess my question really is, can I buy a 2nd hand non O2 phone (unlocked) and will that work with wifi calling, or does it need to have the original O2 firmware on it. Indeed can one flash O2 firmware onto a non O2 phone to make it compatible with wifi calling with O2?

 

Regards

Message 3 of 14
6,548 Views

Cleoriff
Level 94: Supreme
  • 106279 Posts
  • 790 Topics
  • 5478 Solutions
Registered:

@Sinkers 

A second hand non O2 phone won't work with wifi calling.

With regards flashing to get the right firmware, that has been hit and miss from what I've read.

ie it SHOULD work but some people have had issues.

*The Game Is On*

Girl in a jacket
Message 4 of 14
6,544 Views

Sinkers
  • 11 Posts
  • 3 Topics
  • 0 Solutions
Registered:

Many thanks for that

Message 5 of 14
6,542 Views

MI5
Level 94: Supreme
  • 122155 Posts
  • 609 Topics
  • 18946 Solutions
Registered:

@Sinkers wifi calling will work on any S9 regardless of firmware.

I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.

Currently using:
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)

View solution in original post

Message 6 of 14
6,541 Views

Cleoriff
Level 94: Supreme
  • 106279 Posts
  • 790 Topics
  • 5478 Solutions
Registered:

@MI5 wrote:

@Sinkers wifi calling will work on any S9 regardless of firmware.


Well if that's the case, that's a mistake on my part. I've read a few posts on here before I answered which claimed it didn't.

*The Game Is On*

Girl in a jacket
Message 7 of 14
6,536 Views

MI5
Level 94: Supreme
  • 122155 Posts
  • 609 Topics
  • 18946 Solutions
Registered:
Everything from S8 onward works on any firmware (allegedly).
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.

Currently using:
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)
Message 8 of 14
6,533 Views

Cleoriff
Level 94: Supreme
  • 106279 Posts
  • 790 Topics
  • 5478 Solutions
Registered:

In fact, in the link I gave it states this

 

Your device should use O2 firmware if you bought it direct from us in an O2 shop, online or over the phone.

To check if your phone’s running O2 firmware, dial *#1234# and look at the CSC entry. If this line includes ‘TEF’, ‘O2U’ or ‘OTF’ then your device has O2 firmware and you can set up Wifi and 4G Calling. 
If the CSC doesn't include one of these codes then Wifi and 4G Calling isn’t supported on your phone right now.

If you need more info contact O2 business customer services.

*The Game Is On*

Girl in a jacket
Message 9 of 14
6,533 Views

Sinkers
Level 1: Joiner
  • 11 Posts
  • 3 Topics
  • 0 Solutions
Registered:

>wifi calling will work on any S9 regardless of firmware.

 

That is very interesting - and good news. Thanks

Message 10 of 14
6,532 Views