3 ms·

Or you can just use WIFI and turn the baseband off like I do. The cell companies are all crooks anyways (in the US), and I don't want to do business with them.

mahouse 11y ago
Doesn't the baseband control wifi too anyway? You should see the amount of things the SoC/baseband does.
- awch 11y ago
  Interested in the answer to this question.
- ytjohn 11y ago
  The baseband chip is a separate chip than the one providing wifi, bluetooth, nfc, etc. Essentially, the wifi/bt/etc chips fall on the computer side and can be controlled/manipulated by the phone's OS. The baseband chip is a standalone system that is controlled by the cell towers, and then is tied into the phone's cpu directly. Phone builders essentially buy the baseband chip that is certified on different network types and add it to their PCB. In reality, the baseband should be connected more like a serial port (with some audio channels to the mic and speaker). In fact, it's treated very much that way in software - you interact with it by sending AT commands. But, as others have pointed out, it can send commands directly to the phone's CPU and access the phone's internal memory.
deleted 11y ago
[deleted]
mitchtbaum 11y ago
On Android: 1. Put ##4636## into the Dialer (or use any application available on the Market like 4636 — takes you to the same service screen) 2. Choose Phone Information 3. Press Turn off radio (source) http://forum.xda-developers.com/showpost.php?s=c8b62d54e971b88f86375dc33bf1f198&p=51972020&postcount=15 http://forum.xda-developers.com/showpost.php?s=c8b62d54e971b... (more discussion) http://android.stackexchange.com/questions/7133/how-do-i-turn-off-the-cellular-radio-without-disabling-bluetooth http://android.stackexchange.com/questions/7133/how-do-i-tur...
- est 11y ago
  for easier remembering and correctly formatted: *#*#INFO#*#*
peterwwillis 11y ago
Indeed, if you have a second cell modem or smartphone, the modem can connect to the cellular network and provide an IP over Wifi, and the smartphone can use wifi to connect to it. Thus the smartphone is protected by its OS's firewall and any compromises stay on the cell modem, the same way they do with home internet connections.
raarts 11y ago
Problem is, when you use VoIP over WiFi, you loose echo-cancellation, because the echo cancel hardware resides in the baseband and is not used in WiFi calls.
- wolfgke 11y ago
  Just use a headset that supports echo cancellation in hardware?
- Jude2711990 11y ago
  You may also consider echo cancellation software that is capable of doing server side echo cancellation that can handle the long echo tail. For example, take a look at the options provided by SoliCall.

mahouse 11y ago

Doesn't the baseband control wifi too anyway? You should see the amount of things the SoC/baseband does.

awch 11y ago
Interested in the answer to this question.
ytjohn 11y ago
The baseband chip is a separate chip than the one providing wifi, bluetooth, nfc, etc. Essentially, the wifi/bt/etc chips fall on the computer side and can be controlled/manipulated by the phone's OS. The baseband chip is a standalone system that is controlled by the cell towers, and then is tied into the phone's cpu directly. Phone builders essentially buy the baseband chip that is certified on different network types and add it to their PCB. In reality, the baseband should be connected more like a serial port (with some audio channels to the mic and speaker). In fact, it's treated very much that way in software - you interact with it by sending AT commands. But, as others have pointed out, it can send commands directly to the phone's CPU and access the phone's internal memory.

deleted 11y ago

[deleted]

mitchtbaum 11y ago

On Android: 1. Put ##4636## into the Dialer (or use any application available on the Market like 4636 — takes you to the same service screen) 2. Choose Phone Information 3. Press Turn off radio (source) http://forum.xda-developers.com/showpost.php?s=c8b62d54e971b88f86375dc33bf1f198&p=51972020&postcount=15 http://forum.xda-developers.com/showpost.php?s=c8b62d54e971b... (more discussion) http://android.stackexchange.com/questions/7133/how-do-i-turn-off-the-cellular-radio-without-disabling-bluetooth http://android.stackexchange.com/questions/7133/how-do-i-tur...

est 11y ago
for easier remembering and correctly formatted: *#*#INFO#*#*

peterwwillis 11y ago

Indeed, if you have a second cell modem or smartphone, the modem can connect to the cellular network and provide an IP over Wifi, and the smartphone can use wifi to connect to it. Thus the smartphone is protected by its OS's firewall and any compromises stay on the cell modem, the same way they do with home internet connections.

raarts 11y ago

Problem is, when you use VoIP over WiFi, you loose echo-cancellation, because the echo cancel hardware resides in the baseband and is not used in WiFi calls.

wolfgke 11y ago
Just use a headset that supports echo cancellation in hardware?
Jude2711990 11y ago
You may also consider echo cancellation software that is capable of doing server side echo cancellation that can handle the long echo tail. For example, take a look at the options provided by SoliCall.