Abstract: Various embodiments enable recovering from an out-of-service state in a wireless device. A processor may perform scans of a first acquisition database to acquire a first renewed service connection for a first subscriber identification module (SIM). The scans include first and second searches for first and second channels identified in first and second technology lists, respectively, from the first acquisition database, respectively, until either a renewed service connection is acquired or each of the first and second technology lists are exhausted. The first and second technology lists identify channels from first and second radio access technologies. A currently used channel of a second SIM acquired service is first on the first technology list. The processor may perform a full frequency scan to acquire a first renewed service connection for the first SIM in response to determining that each of the first and second technology lists were exhausted.

Abstract: Methods and devices are disclosed for enabling efficient network registration using a shared radio resource for at least a first and second SIM of a multi-SIM wireless communication device. After the end of a radio-off condition of the radio resource, the wireless device may identify services supported by each of the first and second SIMs, evaluate criticality of the supported services, determine which of the first and second SIM supports the service having the highest criticality, and prevent the other SIM from registering with its network before the SIM with the service of the highest criticality has successfully registered for service in its selected network.

Abstract: Methods and devices are disclosed for enabling efficient service acquisition on multiple SIMs of a multi-SIM wireless communication device. After both SIMs have lost service, or after initial power up of the wireless device, the wireless device may detect radio frequency channels associated with wireless networks of all SIMs, and determine whether the strongest received radio frequency channel matches a preferred network of any SIM. Upon detecting a match, the wireless device may awaken that SIM and automatically camp that SIM on cell of the matched radio frequency channel. In this manner, the wireless device may avoid repetition typically involved in acquiring service on multiple SIMs.

Abstract: The present disclosure presents a method and an apparatus for searching for service when a multi-mode UE goes out of service (OOS). For example, the disclosure presents a method for receiving a request to scan frequencies of a RPLMN of a first RAT and scanning the frequencies of the first RAT based on an acquisition database (ACQ DB). In addition, such an example method, may include sending an available PLMN list to the NAS layer, switching to a second RAT based on a request from the NAS layer, scanning frequencies of the second RAT based on the ACQ DB, and camping on a frequency of the second RAT found during the scanning of the frequencies of the second RAT based on the ACQ DB. As such, a method and an apparatus for searching for service when a multi-mode UE goes OOS may be achieved.

Abstract: Methods and devices are disclosed for enabling efficient network registration using a shared radio resource for at least a first and second SIM of a multi-SIM wireless communication device. After the end of a radio-off condition of the radio resource, the wireless device may identify services supported by each of the first and second SIMs, evaluate criticality of the supported services, determine which of the first and second SIM supports the service having the highest criticality, and prevent the other SIM from registering with its network before the SIM with the service of the highest criticality has successfully registered for service in its selected network.

Abstract: A method for performing manual public land mobile network (PLMN) search includes: receiving a command to perform manual PLMN search on an inactive subscription associated with a first subscriber identity module (SIM) of a communication device; determining if a data connection is enabled on an active subscription associated with a second SIM of the communication device; and if the data connection is not enabled on the active subscription, performing the manual PLMN search on the inactive subscription by tuning away from the active subscription to identify available operators associated with the first SIM.

Abstract: A method for performing manual public land mobile network (PLMN) search includes: receiving a command to perform manual PLMN search on an inactive subscription associated with a first subscriber identity module (SIM) of a communication device; determining if a data connection is enabled on an active subscription associated with a second SIM of the communication device; and if the data connection is not enabled on the active subscription, performing the manual PLMN search on the inactive subscription by tuning away from the active subscription to identify available operators associated with the first SIM.

Abstract: Methods and devices are disclosed for enabling efficient service acquisition on multiple SIMs of a multi-SIM wireless communication device. After both SIMs have lost service, or after initial power up of the wireless device, the wireless device may detect radio frequency channels associated with wireless networks of all SIMs, and determine whether the strongest received radio frequency channel matches a preferred network of any SIM. Upon detecting a match, the wireless device may awaken that SIM and automatically camp that SIM on cell of the matched radio frequency channel. In this manner, the wireless device may avoid repetition typically involved in acquiring service on multiple SIMs.

Abstract: Methods, devices, and systems embodiments enable recovering from an out-of-service state in a wireless device. A processor may perform scans of first and second acquisition databases to acquire a first renewed service connection for a first subscriber identification module (SIM). The scans include first and second searches for first channels identified in first and second technology lists, respectively, from the first and second acquisition database, respectively, until either a renewed service connection is acquired or each of the first and second technology lists are exhausted. The first and second technology lists identify channels from a most recently used radio access technology of the respective acquisition databases. The processor may perform a full frequency scan to acquire a first renewed service connection for the first SIM in response to determining that each of the first and second technology lists were exhausted.

Abstract: The present disclosure presents a method and an apparatus for searching for service when a multi-mode UE goes out of service (OOS). For example, the disclosure presents a method for receiving a request to scan frequencies of a RPLMN of a first RAT and scanning the frequencies of the first RAT based on an acquisition database (ACQ DB). In addition, such an example method, may include sending an available PLMN list to the NAS layer, switching to a second RAT based on a request from the NAS layer, scanning frequencies of the second RAT based on the ACQ DB, and camping on a frequency of the second RAT found during the scanning of the frequencies of the second RAT based on the ACQ DB. As such, a method and an apparatus for searching for service when a multi-mode UE goes OOS may be achieved.