1. AC Question's Avatar
    Presently I am using only 1 SIM in my Asus Zenfone 2 ZE551ML. My SIM2 slot shows unavailable. Do we have to put SIM in Slot 1 first and then only SIM2 is available? My phone model number: ASUS_Z400AD Software version WW_2.20.40.168_20160202
    Android version 5.0 with Android security patch January 1, 2016.
    Plz let me know whether this is a software issue or a hardware problem, I have changed the sim card reader also then also this issue persists.
    03-07-2016 09:13 PM
  2. B. Diddy's Avatar
    Welcome to Android Central! You shouldn't have to put a SIM in both slots. Are you sure that SIM works? Can you try it in another phone? Otherwise, ask your carrier for a replacement SIM.
    03-08-2016 01:10 AM
  3. SYTH3R's Avatar
    Hey to check if there is an issue with the SIM slot try running SMMI test :

    How to Enter SMMI_TEST (test hardware)

    Go to Calculator=>type " .12345+= "
    you will be entered to SMMI_TEST

    For software issue try factory resetting your device also check the same under safe mode.
    B. Diddy likes this.
    03-08-2016 03:52 AM
  4. jimlloyd40's Avatar
    Nice. Where did you learn things like that?

    Posted via the Android Central App
    03-24-2016 12:53 PM

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