I purchased 5k OTP SMS on January 2018 and their API is easy to use, also they provided php coding to ease my job. OTP delivers within 10 seconds, on some critical times it extends upto 15 seconds as per my observation. I need to send email for sender ID approval, other than it everything worked fine for me till now.
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Digimiles is one of the Best Bulk SMS service provider in India which deals into Transactional SMS API, Promotional bulk SMS, OTP SMS via reliable & best bulk SMS Gateway. We are also known as Best Bulk SMS Service Provider in Bangalore