Hey man, you need to control the number of messages each SIM card sends and stop before it gets blocked. Some carriers temporarily block cards after a certain number of messages, but they usually become active again after a day or two. You should monitor these blocks to see if there's any...
You could check out EJOINTECH SMS gateways. They have a user-friendly web interface and provide API access, so you can manage and automate your SMS operations easily.You can check it out from ejointech.shop
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