Looking for a way (an app) to reliably send simple SMS to a group of contacts (the standard Google/Android messaging app doesn't)

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I need this for work.

We’ve had problems with this for over a year, meaning we’re constantly getting feedback that some people don’t get our group SMS. We have tried a few things to no avail.

I have some suspicions as to why it still happens, incl.

  • Android sends them as MMS or something instead of bog-standard SMS
  • iPhone and maybe also dumbphone users cannot receive those
  • there’s a limit on how many SMS you can send at one time (the group has ~20 contacts)

For a short while I used some Group SMS app from the app store. It worked, but it’s not FOSS and a privacy nightmare (Android lets you view these things, tons of 3rd-party stuff).

Maybe there’s a setting I overlooked?

Maybe there’s a dedicated Group SMS FOSS app I’m not aware of?

Maybe some “normal” SMS apps from F-droid has the ability to do what we need?

The phone in question is a CAT phone, I think S42, so the Android version would be 10 or 11. No mods.

Thanks in advance.

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Which app did you try already from F-Droid?

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Fossify Contacts app allows you to select a group of contacts and send plain old SMS to each member of the group. Reliable, simple but of course all replies are to sender only.

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