sms cammpaign

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Hi all, I'm looking for a reliable method for sending SMS messages in the UK, can you suggest the best way and any tricks / tips - not something I've done before but been asked by a client to send regular messages on his behalf. Appreciate any advice you can give.

I'm in need of a software that can clean up phone numbers that I already sent a message to so that I'm not spamming people. I constantly get new phone numbers but occasionally I have repeat inquiries. I tried to illustrate an example of what I'm talking about in the photo below. Any ideas are...