The customer service and support is extremely helpful. They are always willing to help you with any questions or concerns you might have. I never experienced any issues while using their services. I am currently using DSP to send bulk messages, which is very reliable. I have no complaints about DSP as it has been effective and easy to use. It has allowed me to communicate with a large audience and reach them quickly when I need to. I like that it is very easy to use and customize. It's very simple to implement and send bulk sms messages. The price is also great. I dislike that we can only send text messages through this service. I wish we could send voice calls as well. We are using this service to communicate with our clients. This has helped us save money by sending bulk sms messages.