Here in South Europe people mostly use Viber. Edit: I was very unaware about situation in Southern Europe as I’ve learned from this post… Most people in Croatia use Viber!
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Not on SMS you don’t. I’ve seen SMS apps that claim to have verification, at most that’s a verification the edge router of your service received it.
Since there’s no error detection, there’s no way to universally implement read receipts across vendors.
SMS is a best-effort system. Like shouting at the clouds, unfortunately.
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