Technical Service Bulletin
91 Audi phone box customer registration form and reporting obligation by customer to MNO
91 19 28 2051720/2 January 15, 2019. Supersedes Technical Service Bulletin Group 91 number 18-10 dated
September 14, 2018 for reasons listed below.
Model(s)

Year

VIN Range

Vehicle-Specific Equipment

All

2019 - 2022

All

With Audi phone box

Condition
REVISION HISTORY
Revision

Date

Purpose

2

-

Revised Technical Background (Corrected PR Code GB2)
Revised Service (Added FCC ID)

1

09/14/2018

Initial publication

The customer has inquired about the Audi
phone box (Figure 1) and/or wants to know
more about the registration form to be
submitted to the customer’s Mobile
Network Operator (e.g. AT&T, T-Mobile,
Verizon, Sprint, etc.).

Figure 1. Audi phone box with wireless charging.

Technical Background
Audi phone box background information:
Starting with the MY19, vehicles sold in the USA can be equipped with the Audi phone box system (PR Code
GB2). The Audi phone box system includes a Qi compatible wireless charging pad and a wireless connection to
an external LTE antenna located outside the vehicle (Figure 1). Although, by design the system is a “signal
compensator” only moving the signal to outside the vehicle, the FCC has classified this type of device as a “signal
booster”. It is important to note to the customer that this system does not appreciably amplify the signal from the
mobile phone to the network, as with older style signal boosters which were in use before 2013. Thus, if the

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© 2019 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.

Technical Service Bulletin
customer is unable to receive a signal from the MNO to their mobile device while standing outside the vehicle,
using the Audi phone box inside the vehicle will NOT improve the signal strength.
From the FCC.gov website:
The FCC issued a Report and Order on February 20, 2013, that includes rules and policies that will enhance
wireless coverage for consumers, particularly in rural, under-served, and difficult-to-serve areas by broadening
the availability of signal boosters while ensuring that boosters do not adversely affect wireless networks. New
FCC rules for wireless signal boosters came into effect on March 1, 2014. Consumers can read the Consumer
Advisory for consumers who own signal boosters here: https://www.fcc.gov/document/consumer-advisoryinformation-consumers-who-own-signal-boosters.
Audi Dealers MUST provide the registration form the customer at time of delivery.
Audi dealers must provide to the vehicle owner the customer
registration form (Figure 2) found in the glovebox. This form is
installed at the port of arrival in the USA. The form contains
the Make, Model, and Serial number of the Audi phone box
installed in the vehicle. Customers must submit this
information to their personal cell phone service provider
(MNO).

Figure 2. Customer registration form.

Below is a list of the known registration sites for the four most common providers operating in the USA. Please
keep in mind these URLs are subject to change at any time. If the URL does not work, then please ask the
customer to contact their provider’s support center to find the latest registration process which will be specific to
their provider:
 AT&T: https://securec45.securewebsession.com/attsignalbooster.com/.
 Sprint: https://www.sprint.com/en/legal/signal-boosters.html.
 T-Mobile: https://www.signalboosterregistration.com/.
 Verizon: https://www.verizonwireless.com/solutions-and-services/accessories/register-signal-booster/.

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© 2019 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.

Technical Service Bulletin
Production Solution
Not applicable.

Service
If the customer cannot locate the form to register the factory installed Audi phone box, please download and print
off the form which is attached to this TSB. Additionally, the form can be downloaded from ServiceNet located at
Audi >> Technician References >> Electrical >> Audi phone box registration form.
How to fill out the form:
The three main fields on the form are Make, Model, and Serial number.
Make:
 For all Audi vehicles, the Make will be “FKW”.
Model:
 For all Audi vehicles, the Model will be the Audi phone box part number, 4M0.035.456A. For MY19, the part
number is same for all Audi vehicles with the Audi phone box.
Serial Number:
The serial number is the only value which will change
for each vehicle. Each Audi phone box system installed
will have a unique serial number. This serial can be
found in ElsaPro under the vehicle information section
(Figure 3). Additionally, for some MY19 models only
(except D5, C8, and R8), a sticker will be placed in the
rear luggage water drain channel (Figure 4) with the
installed Audi phone box Serial number.

Figure 3. Serial number in ElsaPro.
FCC ID: RK7MBC-NAR
Some providers may require the user to supply the FCC ID for the Audi phone box upon registration. This data is
not an FCC requirement to Audi nor to the customer. Because of this, the FCC ID field is not listed on the
customer registration form. If the MNO requires the FCC ID for registration, then please provide the customer
with the ID listed above. The FCC ID is the same for all vehicles.

Page 3 of 5
© 2019 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.

Technical Service Bulletin

Figure 4. Sticker locations on various Audi models for MY19.

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© 2019 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.

Technical Service Bulletin
For MY19 A8 (D5), A6/A7 (C8), and R8; the serial
number is located on the factory production
sticker. This sticker should already be placed in the
owner’s manual (Figure 5). If the sticker is not in the
owner’s manual, it can be found in the spare wheel well
area or front luggage area of the R8. Please relocate
the sticker to the owner’s manual.

Figure 5. Factory production sticker.

Warranty
This TSB is informational only and not applicable to any Audi Warranty.

Additional Information
All part and service references provided in this TSB (2051720) are subject to change and/or removal. Always
check with your Parts Department and/or ETKA for the latest information and parts bulletins. Please check the
Repair Manual for fasteners, bolts, nuts, and screws that require replacement during the repair.
©2019 Audi of America, Inc. All rights reserved. Information contained in this document is based on the latest
information available at the time of printing and is subject to the copyright and other intellectual property rights of
Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any
time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in
any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these
materials be modified or reposted to other sites, without the prior expressed written permission of the publisher.

Page 5 of 5
© 2019 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of
America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.