What is the correct way to pluralize an acronym?
What's the plural form of "SMS" (if X), like:
I'm concerned, I sent him over a million X but got no response.
I usually use text message to get rid of that situation.
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The common way to pluralize acronyms is to add a lowercase S, so it would be SMSs. But SMS (short message service) is not usually used like that. SMS is the service you use to send text messages. SMS can also be used to talk about a feature-set ("It's got unlimited SMS."), or a technology ("This tablet supports SMS."). Both text (sometimes abbreviated txt) and text message are used.
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If you're talking, it depends on how you pronounce the abbreviation. If, as I imagine, it's /ɛsɛmɛs/ -- just the names of the the letters strung together -- the plural will be pronounced /ɛsɛmɛsəz/. Everything hinges on the last sound. But if you speak English, you already know this.
If you're writing, however, you're on your own on how to spell it. English spelling is not ready for things like this, as everybody who texts knows already. And it probably never will be.
"SMS" refers to the technology or means of sending the messages, not the messages themselves. A plural of SMS would mean more than one technology or means of sending messages. You want "SMS messages" or simply "texts".