And now you got me looking at my mobile.
android if that makes a difference.
while i knew some letter keys added alternatives
NEVER realised holding down the numbers offered the fractions..
in fact i then found the top row of letters actually swaps to the corresponding number.
i rarely have the numbers displayed, as an option in setting,
so switch between letter numbers which can be irritating.
in fact i have now discovered..(only been using android sine it began..

)
that IF you press the Comma icon ( , ) next to ?1234, you get to setting and from there can press advanced.
this option allows for preferences.
low down on page is 'Long press for symbols hint'
and all the alternative choices appear by the letter screen most people start with.
AND if you do as you &
@dunelm suggest (=\< )you can get the copyright, registered trademark & a TICK.
ones i have often wanted to use in quirky posts but struggled finding.
And in amongst that lot, a little button pressing got me to discover the • icon, IF long pressed offers up the card suits.♣♠♥♦
( How strange.
On Mobile it's in the appropriate colours.)
Still, maybe useful for the missing heart in the emoji choice.❤
also offers a music note ♪ )
a link for more info
https://www.howtogeek.com/210824/ho...racters-on-any-computer-smartphone-or-tablet/
DCUK, where every days a school day..