What are the free SMS verification code platforms?

when choosing a group SMS platform, we should consider from many aspects:

1. channel quality: the channel quality includes speed, concurrent quantity, stability, arrival rate and so on (5 seconds, 99% arrival rate)

2. qualification: it depends on whether the SMS platform has the SP certificate of the whole network (triple play) approved by the Ministry of Industry and Information Technology and whether it has the second type of value-added telecommunications. That is, the number 16 certificate

3. Price: generally 3-6 cents/piece (below the market price, we need to consider this platform). Now most SMS platforms adopt ladder pricing, and the greater the recharge, the lower the unit price.

4. Interface language: choose the interface language that supports your own website

5. Service support: professional technical team helps solve the problems of SMS interface, and professional customer service pre-sale trial docking and after-sales service are also very important. Don't find someone to solve an emergency, which will affect the business.