7 ms·

> definitely sent/received SMS over wifi using my iPhone Are you certain? From what I understand about how SMS works, I don’t see how that’s possible. Apple’s

by egwynn 4y ago

> definitely sent/received SMS over wifi using my iPhone Are you certain? From what I understand about how SMS works, I don’t see how that’s possible. Apple’s own docs also appear to suggest that SMS-over-WiFi won’t work: https://support.apple.com/en-us/HT207006 https://support.apple.com/en-us/HT207006

frizlab 4y ago
Most operators do cellular over wifi now (because 4G/5G sucks indoor). Not all of them though.
- egwynn 4y ago
  I’m curious about how this works, can you link me someplace where I can read more about it? I tried searching for “cellular over wifi” but wasn’t about to find anything promising. EDIT: I searched harder and found “VoWiFi”. It looks like this can support SMS and is supported by iOS. TIL.
  - __derek__ 4y ago
    Bingo. My carrier offers it as Wifi Calling. It worked surprisingly well.
  - Anunayj 4y ago
    For someone more curious, I tried to learn more about this tech, and this [1] is the best resource I found about someone explaining how it works. Essentially VoWifi connects to your ISP via a IPSec VPN using secrets derived using your sim card as a smart card, then connects to a internal SIP server and voila. I spent a lot of time trying to connect to the IPSec server from a computer, but couldn't figure out how to get the challenge solved by my sim. Gosh I wish I could make normal calls from my computer. 1. https://worthdoingbadly.com/vowifi/ https://worthdoingbadly.com/vowifi/
    - egwynn 4y ago
      Thanks for this link! This is a great explanation which clears a lot of things up to me.
  - stevewatson301 4y ago
    https://en.wikipedia.org/wiki/Generic_Access_Network https://en.wikipedia.org/wiki/Generic_Access_Network
- GekkePrutser 4y ago
  4G is not so bad here because of the 700 / 800 MHz band which has really good penetration. But 5G is mainly done on 3.5Ghz and that's tough yes. Of course they can use the same frequencies for 5G. Though the bandwidth at such low frequencies is limited, and thus the maximum speeds.

by egwynn 4y ago

frizlab 4y ago

Most operators do cellular over wifi now (because 4G/5G sucks indoor). Not all of them though.

egwynn 4y ago
I’m curious about how this works, can you link me someplace where I can read more about it? I tried searching for “cellular over wifi” but wasn’t about to find anything promising. EDIT: I searched harder and found “VoWiFi”. It looks like this can support SMS and is supported by iOS. TIL.
- __derek__ 4y ago
  Bingo. My carrier offers it as Wifi Calling. It worked surprisingly well.
- Anunayj 4y ago
  For someone more curious, I tried to learn more about this tech, and this [1] is the best resource I found about someone explaining how it works. Essentially VoWifi connects to your ISP via a IPSec VPN using secrets derived using your sim card as a smart card, then connects to a internal SIP server and voila. I spent a lot of time trying to connect to the IPSec server from a computer, but couldn't figure out how to get the challenge solved by my sim. Gosh I wish I could make normal calls from my computer. 1. https://worthdoingbadly.com/vowifi/ https://worthdoingbadly.com/vowifi/
  - egwynn 4y ago
    Thanks for this link! This is a great explanation which clears a lot of things up to me.
- stevewatson301 4y ago
  https://en.wikipedia.org/wiki/Generic_Access_Network https://en.wikipedia.org/wiki/Generic_Access_Network
GekkePrutser 4y ago
4G is not so bad here because of the 700 / 800 MHz band which has really good penetration. But 5G is mainly done on 3.5Ghz and that's tough yes. Of course they can use the same frequencies for 5G. Though the bandwidth at such low frequencies is limited, and thus the maximum speeds.