Which enterprise SMS group sending platform has the lowest tariff and better service?

Everyone is about the same, about 4 cents a piece, you can try it,

1, add an empty number to see if it can be submitted and sent successfully. If you succeed, you have to charge, not.

2. Add a duplicate number to see if it can be screened out. No, don't. In order to avoid overpaying and causing unnecessary harassment to customers.

3. Sending speed.