B737 captain reported executing a high speed rejected takeoff for 'significant airspeed discrepancy'...

Attributes
ACN	1540832
Time
Date	201805
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Flight Phase	Takeoff
Component
Aircraft Component	Airspeed Indicator
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 240 Flight Crew Total 19000 Flight Crew Type 3277
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

We did a rejected takeoff (rejected takeoff) for significant airspeed discrepancy and autothrottle disengage uncommanded. After clearing the runway and running the rejected takeoff qrc; I did a call on ACARS. [Dispatcher] responded that he can't contact me below 20;000 ft. At ZZZ and that I should use a cellphone to contact him. I find it hard to believe that [our company] does not provide pilots with a reliable method to communicate with dispatch.

Original NASA ASRS Text

Title: B737 Captain reported executing a high speed rejected takeoff for 'significant airspeed discrepancy'.

Narrative: We did a rejected takeoff (RTO) for significant airspeed discrepancy and autothrottle disengage uncommanded. After clearing the runway and running the RTO QRC; I did a call on ACARS. [Dispatcher] responded that he can't contact me below 20;000 ft. at ZZZ and that I should use a cellphone to contact him. I find it hard to believe that [our company] does not provide pilots with a reliable method to communicate with dispatch.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.