Frequency for WAS (wireless alert system)?
- Thread starter klinquist
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eorange
♦RF Enabled Member♦
Where did you hear that? It's done through your mobile carrier, just like any other text message:
Wireless Emergency Alerts: Frequently Asked Questions
Wireless Emergency Alerts: Frequently Asked Questions
The carrier sends it out from the tower, but it does not come through the same stream/freq as a text message. You will receive WAS in airplane mode, for instance.
D
DaveNF2G
Guest
One does not correlate with the other. Airplane mode just means that your phone will not be trying to find another tower to log onto. SMS is part of the normal cellular datastream, which continues to operate in airplane mode (otherwise you would not be able to use the phone at all).
I don't understand your last statement. In a modern smartphone's airplane mode, the cellular, wifi, and bluetooth radios are disabled and you don't receive any SMS(for instance).
Hmm...I'm pretty sure "airplane mode" suspends ALL cellular operations, as well as WiFI, BT and any other transceiver the device may have...but I could be wrong. :wink:
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DaveNF2G
Guest
Hmm, I think you're right. I plead "tired after a long day." 
WEA are sent via SMS-CB (Cell Broadcast) over a CBCH (Cell Broadcast Channel), via a CBC (Cell Broadcast Center) node attached to the BSC (base station controller) on GSM networks and RNC (radio network controller) on UMTS networks. SMS-CB are unsubscribed, unconfirmed push messages that are broadcast over a network to all connected devices. As to where when you text, SMS-PP (Point-to-Point) is utilized, normally SMS-PP can not support more than a single number per message. SMS-CB isn't affected by network traffic, so even if the network is under serious load, it is unaffected.
Did a bunch of research into telecommunications not too long ago, especially concerning IMSI-catchers, WMN, telecomm of yesteryear (IT&T/AT&T Long Lines), AUTOVON, SAGE, Echo-Fox, Project ELF, ect...
Did a bunch of research into telecommunications not too long ago, especially concerning IMSI-catchers, WMN, telecomm of yesteryear (IT&T/AT&T Long Lines), AUTOVON, SAGE, Echo-Fox, Project ELF, ect...
Analogrules
Active Member
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Yes, it is the same principle under which you can still have your cell phone company send you an automatic text update on your data usage or minutes usage, even if you have your wifi and data network turned off. I do it all the time. If I have all data turned off on my phone, text messages from the carrier still go through.
slicerwizard
Member
"a separate radio that all US cell phones must have"
An unnecessary expense added to millions of cellphones? I don't think so.
So airplane mode disables all of a phone's transmitters. Nothing says that a message broadcast to all phones can't still be received. Unlike a targeted SMS, there is no need for the system to know which service area your phone is currently in. Or for your phone to send any reply.
That is manufacture dependent, some phones allow the use of BT and WIFI when in airplane mode, others don't.
Exactly, SMS-CB is specifically designed as an unconfirmed push service that is unaffected by traffic load and congestion. It's programmed, when initiated via message to continuously broadcast or send out single transmissions.
Bluetooth and Wi-Fi in Airplane mode?.
What phone allows that? I find it hard to believe.
What phone allows that? I find it hard to believe.
ecps92
Member
Samsung S4 Mini, my Sprint XT603 and BB would do the same.
Put my phone in Airplane Mode, then re-enable the Wifi and Bluetooth and the phone is still in Airplane Mode
Put my phone in Airplane Mode, then re-enable the Wifi and Bluetooth and the phone is still in Airplane Mode
I don't have a definitive list of what models, I do know Sony Ericsson phones allow the use of WIFI and BT. iOS6 and iOS7 allowed WIFI and BT use in Airplane Mode (I don't know if this was discontinued on iOS8/8.1). Through API on Android, you can alter Airplane Mode values to exclude WIFI and BT, however it's API framework level based (AFAIK it only works with Jellybean 4.2 or newer, don't take my word on it though).
It's not a big surprise, since the FAA has allowed the expanded use of devices in non-cellular mode on aircraft, at airline discretion of course;
Press Release – FAA to Allow Airlines to Expand Use of Personal Electronics
mmckenna
I ♥ Ø
iPhone ios 8.1 will do it, so have the last few (at least) versions before that.
If you turn on "airplane" mode, it will shut all the radios off. You can then go in and manually turn WiFi and BlueTooth on.
Default, however, is to shut the WiFi and BT off.
I don't have an iPhone, so I haven't seen the new release, but good to know it's still possible.
I'll have to check it out. Thanks.
MeddleMan
Member
WAS
I've received those amber and silver alerts regularly on the interstates, not while in airplane mode.
I've received those amber and silver alerts regularly on the interstates, not while in airplane mode.
CapStar362
Member
i have NEVER seen AP mode disable WiFi and BT. WiFi has been on aircraft for a few years now, and AP Mode would disable the Cell Radio.
ecps92
Member
When you initially got to AP Mode, ALL transmitters are disabled.
You can then enable them, one for one.
Bluetooth, Wifi
You can then enable them, one for one.
Bluetooth, Wifi
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