本文介绍了一种验证手机IMEI有效性的方法，并通过参考手机进行对比测试，确保在不同网络环境下ECC紧急呼叫功能可用。由于无SIM卡状态下手机会自动选择网络，因此建议在多个地点进行测试。
Check if the phone has valid IMEI
Use reference phone, switch to same RAT(2G/3G), check if ECC call available.
Note: Phone will perform cell selection regardless of PLMN when no SIM insert, thence different phones may select cells of different PLMNs due to disparity of HW performance, so we should change more locations when perform reference test.
Use reference phone, switch to same RAT(2G/3G), check if ECC call available.
Note: Phone will perform cell selection regardless of PLMN when no SIM insert, thence different phones may select cells of different PLMNs due to disparity of HW performance, so we should change more locations when perform reference test.
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