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There should be a way to check the # of times a text message has been read, along with timestamps.

Er, no. There should be a way to actually secure one's phone.

Every phone I've used for the last 5 years had a pin number function.

Not every phone does, but even those that do often have so few numbers in the PIN that it's basically window dressing security. Are there phones that have 7-10 digit PINs?

How long are your showers that a person would be able to brute force even a 4-digit pin in the time it took you to come back?

For a one night stand, that's fine, I guess. Or maybe you change your PIN every day? :) Even if you do that, your partner will get lucky once every coupla weeks or so.

Anyway, I'm not advocating keeping secrets from your partner, but for people who depend on keeping secrets on their phone, (at least) most phones today do not have anything other than playtime security.

If your girlfriend is motivated enough that she's willing to bruteforce a 4 digit pin in any length of time, you better be pretty careful.

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