There's another thing you can do that's similar to meme comments.
You can make a meme, then click show embed codes, and then copy and paste it into a text comment. When you trim the beginning and end off it (the parts in brackets), it comes out as blue text saying "Click to show." If people click on it, it will show your meme as if it's a meme comment.
It takes a bit longer (and I'm not sure if it would be all that easy to do on a phone, anyway), but it's another option until your meme comment ability comes back - which I hope won't take too long.
You can see some examples if you look for starflightthenightwing's comments near the bottom of front page memes (if you want to see what the result looks like).
Here are more detailed instructions about how to do it, here on anona247's meme (top comment):
imgflip.com/i/vk8n9