Currently, T-Mobile and some carriers block bulk SMS when sent in high volumes, causing messages not to reach recipients.
When sending bulk SMS through RingCentral, messages to T-Mobile numbers often fail if too many are sent at once due to their rate-limiting feature. I suggest adding a scheduling feature that automatically sends messages in smaller batches. This would reduce failed messages, ensure important messages reach recipients, and improve the overall reliability of bulk SMS campaigns.
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Hanna
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