What to do when SIM slots aren't working on the OnePlus 2?

Both of my sim slots is not working...  But my sim is working in other phones.  But in my phone it shows as NO SERVICE...  What do i do?  I got this just on dec 15




I just bought a OnePlus 2 unit. My previous SIm card from Windmobile, which fits in Samsung phone real well, but it seems unable to fit in the Sim slot. Did I put in the wrong place or you have some ways to put it? Please help . Thanks Harry



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