Development Scope
Scope and Basic Check
Determine the existing foundation, technical dependencies and content that needs to be developed based on modules and firmware, SIM circuits, card types, operators, APNs, switching conditions and business recovery requirements.
Implementation and integration
Complete SIM interface and protection, card recognition diagnosis, switching trigger and state machine, distinguish card switching, network registration, platform connection and business recovery.
Delivery Documentation
Deliver interface design, switching procedures and target card and network test records.
Verification and Constraints
It is necessary to distinguish the SIM interface, circuit switching and carrier services, and the target APN can be used without presetting any card.
Project implementation process
Verification of data and interfaces → Confirmation of technical solutions and verification use cases → Implementation of integration with the target environment → Regression of abnormal scenarios → Transfer of version data.
Verify the implementation results in the target hardware and software environment, and deliver records of associated interface configurations, version dependencies, and problem handling to facilitate subsequent integration and maintenance by the enterprise R&D team.
Project Inputs
- Modules and firmware, SIM circuits, card types, operators, APNs, handover conditions and service recovery requirements.
- Design information, code, interface permissions and target test equipment can be provided.
- Source files, programs or tools expected to be delivered, inter-module integration testing responsibilities and project nodes.
- Acceptance samples, environment, test conditions and passing thresholds.
Deliverables and Acceptance
| Deliverables | Delivery content | Verification method |
|---|---|---|
| achieve results | Deliver interface design, switching procedures and target card and network test records. | Test no card, abnormal card and card recognition recovery. |
| Integrated data | Versions and dependencies, interface configuration, usage or deployment steps, and integration changes | Verify switching conditions and anti-shake. |
| Verify records | Test conditions, execution records, problem lists and regression results | Record the time taken for registration, link building and business recovery. |
The delivery scope and acceptance criteria are determined based on the target environment. Third-party SDK, licenses, laboratories, cloud resources, equipment materials and on-site support are listed separately; when the existing information is insufficient, follow-up work will be determined through interface verification or key function verification.
Frequently Asked Questions
Can dual-SIM switching maintain two networks at the same time?+
Depends on whether the hardware and module support simultaneous online. The single-standby solution requires disconnection and re-registration, and the number of dual cards alone cannot prove the dual-link concurrency capability.
What information is required for 4G SIM interface and dual-card switching development?+
Please give priority to providing the module and firmware, SIM circuit, card type, operator, APN, switching conditions and business recovery requirements. At the same time, the existing implementation, problems encountered, expected changes, and compatible test conditions are explained to facilitate the determination of implementation scope and reproduction methods.
Can it be implemented on existing products?+
You can first evaluate the scope of existing designs and versions that can be changed, retain the verified parts, and determine the interfaces and dependencies that need to be adjusted. This service needs to be noted: SIM interface, circuit switching and operator services need to be distinguished. The target APN can be used without presetting any card. Existing and new functions must undergo regression testing within the agreed scope after the changes.
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