Merge "Revert "Use TelephonyManager#isEmergencyNumber() instead"" am: a281046577

Original change: https://android-review.googlesource.com/c/platform/external/ims/+/1702032

Change-Id: Ibb3c11c7bef069dcde89920259e14bac75b70bca
tree: 61a6b105ad082b0816e25a1503d4a77d39457de1
  1. rcs/
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