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How does Samsung i8552 distinguish whether the received SMS is sim card 1 or sim card 2?

Hello:

According to your description, the dual-card mobile phone will be prompted by card 1 or card 2 when sending and receiving short messages. If your phone receives this message without prompting, please try the following steps:

1. Please uninstall the recently downloaded and installed third-party software.

2. Restore the factory settings after the important data of the mobile phone is backed up: Setup-Reset-Restore the factory settings.

Welcome to Samsung Electronics official website for more information: