• Sign Up! To view all forums and unlock additional cool features

    Welcome to the #1 Dodge, Jeep and RAM Forum dedicated to FCA owners and enthusiasts. Register for an account, it's free and it's easy, so don't hesitate to join the SRT Forum today!


How-To: Cell Comm Killer.

OP
Diboblo

Diboblo

5000 Posts Club
Founding Member
Wiki Contributor
Member ID
#1044
Messages
5,251
Reactions
27,923
Likes
352
City
Riverside
State
CA
Country
United States
Vehicle
2015 Dodge Charger Hellcat!
Thread Starter #101

Lilschmied

Member
Founding Member
Member ID
#1052
Messages
54
Reactions
60
Likes
17
City
Nowhereville
State
Non-US
Country
United States
Member ID
#19817
Messages
36
Reactions
15
Likes
2
City
Mount Pleasant
State
SC
Country
United States
Vehicle
2023 Challenger
The effort is ongoing! I'm bouncing a few questions off of a career expert in antenna design and radio transmission, as he has time. The attempt to shield the entire card is on-hold until I get a few more questions answered.
 


OP
Diboblo

Diboblo

5000 Posts Club
Founding Member
Wiki Contributor
Member ID
#1044
Messages
5,251
Reactions
27,923
Likes
352
City
Riverside
State
CA
Country
United States
Vehicle
2015 Dodge Charger Hellcat!
Thread Starter #104
Had a thought, while braving the heat, at the shop... All of this tinkering woud be moot, if we find and removed the SIM card.

Just throwing it out there.

I did a small amount of research and some manufacturers use a dongle, inside the dash, that accepts the SIM. After it cools down a bit, I'm going to remove the glive box and poke around, in the dash.

Food for thought.

Hemi Rocket Barge
 


fumanchu182

3000 Posts Club
Vendor
Premium Account
U.S. Navy Veteran
Donating Member
9 Second Best E/T
HFCOTM
Member ID
#2366
Messages
3,635
Reactions
8,881
Likes
302
City
Pasadena
State
MD
Country
United States
Vehicle
2015 Challenger SRT Hellcat
Had a thought, while braving the heat, at the shop... All of this tinkering woud be moot, if we find and removed the SIM card.

Just throwing it out there.

I did a small amount of research and some manufacturers use a dongle, inside the dash, that accepts the SIM. After it cools down a bit, I'm going to remove the glive box and poke around, in the dash.

Food for thought.

Hemi Rocket Barge
Had my dash apart. Didn’t find a sim chip on my 2015. Maybe embedded in the stack?
 


Member ID
#19817
Messages
36
Reactions
15
Likes
2
City
Mount Pleasant
State
SC
Country
United States
Vehicle
2023 Challenger
Had my dash apart. Didn’t find a sim chip on my 2015. Maybe embedded in the stack?
Same for the 2023. While the card is different between the 2015 and 2023 (different gen cards, both Sierra AFAIK), from everything I've been able to find, the sim's embedded on the AR7552 card. Photo below is the guts of the 7552 that does the actual transmission.

You're 100% right that if we could locate a separate SIM that would be ideal, but haven't found evidence that exists. If you find other data that suggests otherwise, would be very interested to hear.

Clearer chip photo AR7552.jpg
 


Lilschmied

Member
Founding Member
Member ID
#1052
Messages
54
Reactions
60
Likes
17
City
Nowhereville
State
Non-US
Country
United States
Had my dash apart. Didn’t find a sim chip on my 2015. Maybe embedded in the stack?
They should have an eSim so no physical component to remove unless it's just a flash memory chip which probably breaks other things.


Even without a sim, you can ping a tower for emergency services you're just not registered on a provider to receive calls. The IMEI still identifies your unique modem.
 


Last edited:

Lilschmied

Member
Founding Member
Member ID
#1052
Messages
54
Reactions
60
Likes
17
City
Nowhereville
State
Non-US
Country
United States
Has a anyone tried removing the antenna jacks from the sierra board? That little stub would act as an antenna. Short of wrapping the board in a complete faraday cage I don't think there's a good way to kill cell without disabling the chip by yanking it or killing power to it.

Maybe some paint:
1720655086360.png
 


OP
Diboblo

Diboblo

5000 Posts Club
Founding Member
Wiki Contributor
Member ID
#1044
Messages
5,251
Reactions
27,923
Likes
352
City
Riverside
State
CA
Country
United States
Vehicle
2015 Dodge Charger Hellcat!
Thread Starter #109
Has a anyone tried removing the antenna jacks from the sierra board? That little stub would act as an antenna. Short of wrapping the board in a complete faraday cage I don't think there's a good way to kill cell without disabling the chip by yanking it or killing power to it.

Maybe some paint:
View attachment 142437
Yeah. For MY17+ vehicles, powering down the card may be the solution. Probably a lot more work than most want to engage in, but if you value your privacy, it's a small price to pay.

Hemi Rocket Barge
 


Member ID
#1309
Messages
225
Reactions
345
Likes
37
City
Orem
State
UT
Country
United States
Vehicle
2017 Challenger Hellcat
So what exact MY did this change happen that the simple blocker design is no longer sufficient? before 2017 or after 2017?
 


OP
Diboblo

Diboblo

5000 Posts Club
Founding Member
Wiki Contributor
Member ID
#1044
Messages
5,251
Reactions
27,923
Likes
352
City
Riverside
State
CA
Country
United States
Vehicle
2015 Dodge Charger Hellcat!
Thread Starter #111
So what exact MY did this change happen that the simple blocker design is no longer sufficient? before 2017 or after 2017?
MY15 MY16 simple FAKRA D dongle disablesall cellcomms.

MY17+ has 2 antennae (violet and pink) and a suspected onboard antenna. After both ports were blocked, the Sierra card still maintained a signal.

There are three wires, on the board: Grey, Black and White. Remove these and disable the cell. You would need to use shrink tube on the end of each wire, before applying power.

Hemi Rocket Barge
 




Top