Greek Text: Letters with accent or breathing mark not appearing?

Device: Samsung Galaxy S4
Problem: I am using Anki to help learn Koine Greek, and the characters with a breathing mark or an accent do not appear, this problem also showed up this morning with an online test in Socrative.
for Example: ἀγγελος will appear as γγελος, and ἡιλίος will appear as ιλ ος

any suggestions on what this problem may be or how to fix it?
(note: I am not typing greek on my phone only viewing it)

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