"I will text you."
Translation:E kelekiko au iā ʻoe.
(E) can be a mark for the future. However, it has a less definite commitment to the time frame. Note: the difference between (e verb ana) and (e). (E) often translates as (will) while (E verb ana) often translates as (going to).
(E) kelekiko au iā ʻoe. = I will text you.
(E) kelekiko (ana) au iā ʻoe. = I am going to text you.