I came across Fastsms when my earlier company closed, but usefully named three others that one could join. This is the best in my opinion. I found the Chat method of asking a question very helpful,quick response,no waiting in a phone queue. So convenient for this 83 year-old to type on the full keyboard of a 19 inch laptop, rather than a titchy mobile.
About product: Very good at only 4.2p including vat per text. The system even allows 3 texts to be combined into one. I paid by credit card,simple. £4.20 for a big 100.