Google's GBoard software keyboard has a Morse code mode.
Here's what characters it currently supports:
.-→a-...→b-.-.→c-..→d.→e..-.→f--.→g....→h..→i.---→j-.-→k.-..→l--→m-.→n---→o.--.→p--.-→q.-.→r...→s-→t..-→u...-→v.--→w-..-→x-.--→y--..→z-----→0.----→1..---→2...--→3....-→4.....→5-....→6--...→7---..→8----.→9.-.-.-→.--..--→,..--..→?.----.→'-.-.--→!-..-.→/-.--.→(-.--.-→).-...→&---...→:-.-.-.→;-...-→=.-.-.→+-....-→-..--.-→_.--.-.→@.-..-.→"...-.→*-.-.-→\---.-→%--.-.→#--.-.-→|......→^.---..→~-..-.-→`...-..→$.--..→[.--..-→].--.-→{.--.--→}-.---→<-.----→>..--→[space].-.-→[enter]....-.→[shift]----→[backspace].-----→[candidate 1]..----→[candidate 2]...---→[candidate 3]
See https://ham.stackexchange.com/questions/10260/morse-code-meta-command-sequences/10440#10440 for context and a bit more high-level discussion.
Found in one of the files containing UPDATE_MORSE_BUFFER of GBoard APK disassembly via online JADX tool ["com.google.android.inputmethod.latin_7.3.3.199102047-beta-arm64-v8a-26730306_minAPI21(arm64-v8a)(nodpi)_apkmirror.com_source_from_JADX/p000/ayb.java"], manually fixed up from a chained method call.
@natevw Oh thanks for the notice! Yeah, Jekyll found it's cool to change the link when I add the post retroactively to a category... hehe, forgot about that. Corrected original comment with correct link.