Comment on Zerodha-Fund withdrawal from Trading account

hi, I am interested to open demat and trading acc in zerodha. Pls clarify some queries which I have:
1. I am from Chennai. Do you have office here? If I change my current location(somewhere north or east) in future will this be a problem since Zerodha is basically working from Bangalore?
2. Can the software be used in mobile /smartphone?
3. If I have to use only PC ,then what is the time in day till when I can do trading (buying/selling)? 🙁 I am very new here. So don’t know about time
4. what is difference between CM segment cash delivery and F&O segment-future?

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