US 12,256,304 B2
Method and device for preparing emergency call and storage medium
Xin Xu, Palo Alto, CA (US); Yongsheng Shi, Palo Alto, CA (US); and Jun Niu, Palo Alto, CA (US)
Assigned to GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD., Guangdong (CN)
Filed by GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD., Guangdong (CN)
Filed on May 23, 2022, as Appl. No. 17/750,542.
Application 17/750,542 is a continuation of application No. PCT/CN2020/128749, filed on Nov. 13, 2020.
Claims priority of provisional application 62/949,360, filed on Dec. 17, 2019.
Prior Publication US 2022/0286835 A1, Sep. 8, 2022
Int. Cl. H04W 4/90 (2018.01); H04W 8/26 (2009.01); H04W 76/50 (2018.01)
CPC H04W 4/90 (2018.02) [H04W 8/26 (2013.01); H04W 76/50 (2018.02)] 12 Claims
OG exemplary drawing
 
1. A method for preparing an emergency call on a device, the method comprising:
detecting that a user of the device has initiated an emergency call;
obtaining an indication of a current geographical location of the device; and
selecting an emergency number to be called for the emergency call in response to the detecting, and based on the obtained indication;
wherein the method further comprises:
switching the device from a first radio access technology (RAT) to a second RAT in response to the detecting, wherein a type of the second RAT is circuit-switched;
switching an active Subscriber Identity Module (SIM) of the device from a first SIM to a second SIM in response to the detecting; and
using the selected emergency number, a subscription associated with the second SIM, and the second RAT to place the emergency call.