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What short message sending platforms have a good reputation?

The following points can be considered

1. Companies that directly cooperate with the three major operators, that is, companies that issue qualifications, send messages very slowly because the services of third-party agents are not guaranteed and the SMS channels are blocked.

2. The proportion of SMS arrival rate

3. Suggestions such as response time verification code for receiving short messages are to use three independent channels.

4. The price is also part of the reference (our company now has the qualification of telecom operators to test first)