My iPhone 3g won't let me log in to instagram?

I have an iPhone 3g with no cellular service (but it has Wi-Fi) and it has the most recent version of instagram that is compatible for 3g. Every time i try to log in it tells me to update instagram, but i can't do that, so does anyone know how to fix it? Twitter works, why doesn't instagram?

That's a pretty old iPhone. I don't use Instagram, but I assume that Instagram doesn't allow very outdated apps to work anymore. Just an assumption, though.

Do you really need to use an old iPhone?

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