在没有SIM卡的情况下，通过切换到相同的RAT（2G/3G）并检查ECC呼叫是否可用，来验证手机的合法IMEI。注意，由于不同手机在硬件性能上的差异，选择的基站可能来自不同的PLMN，因此进行参考测试时应更换更多位置。
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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