Bulk SMS sender to 4k Mobile Numbers -- 2

Hello, I am in need of a bulk SMS sender service to send out promotional messages to 4,000 mobile numbers. I have the full content for the message already prepared, so all that is needed is the capability to do the actual sending. This service needs to be reliable and able to handle large batches of messages quickly so I can send out my messages efficiently. If you are able to provide this service, please contact me and let me know what you can do. Thank you!