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Translation via Google Translate:
Hello everyone, I would like to know how we can send an SMS to several people at the same time. Because when I want to select my contacts is one by one, I can not check several at the same time. Whereas with my old Sony it was possible
Bonjour à tous, j'aimerais savoir comment on peut envoyer un SMS à plusieurs personnes en même temps. Car quand je veux sélectionner mes contacts c'est un à un, je ne peux pas en cocher plusieurs en même temps. Alors qu'avec mon ancien Sony c'était possible
You can send group sms.
New message and than add contact,one by one.
That is a great question, because it reveals that there is no way to do this on the stock messaging app. It forces you to add recipients one at a time. Quite annoying. But if you switch to WhatsApp you can create groups easily. It has a nice UI too. Of course, everyone in the group needs to have WhatsApp, but I've found that lots of people already use it. I was actually a latecomer to it. Good luck.
Same goes for Signal which sends messages and SMS mixed depending on if the receiver installed Signal.