What emoji keyboard works on 1st generation iPhone?

My friend wants to know what emoji keyboard works on first generation iPhone. Can someone help?

Thats just too outdated and hardware is too old to run anything new. Why would you use that when a new 4S is free on 2 year contract? Walmart is offering 5C for a $1 now on contract, no reason not to upgrade.

Her parents won't let her upgrade yet that's why I asked.

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