facing a peculiar problem with my o1. No sd card seems to be working now. Earlier i was using a STRONTIUM class 4 sd card almost full. Even using class 4 sd card my phone hangs and had to remove battery sometimes. today it hanged several times and now no sd card is getting detected by my phone. actually what i was doing MOVING AN APP FROM PHONE MEMORY TO SD CARD suddenly it hanged and i had to remove battery and restarted again. then comes devil notification REMOVED SD CARD. Done almost everything from formatting sd card, tested 4 new sd cards, reset mobile data and cache, did factory data reset, yet no result. Even the card that came with o1 is not working. Is there anyone who can give me a clear picture what happened to my phone. Can anyone help me out here?