Re: how can I deactivate Pin code on my 640 xl ?
Are we talking about the Pin for your SIM? if you are follow these steps (Note my settings app kept crashing so I'm using the lone way):
tap on phone icon (startscreen) > select "history" > tap on the three dots (bottom right) > select "change more settings..." > scroll down and select "cellular & sim" > sim settings > scroll down and select "use sim pin"
If there was a previous PIN, you will need to know it at this point, if you don't; DO NOT try to guess it
if you were talking about the pin you enter when unlocking the phone, follow these steps:
settings > personalization > lock screen > scroll down and select "sign-in options" > select "add"
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