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I had an inflated bill and checked online to find the same number. Apparently this was related to a charity / lottery in the UK that my wife saw on TV. Once she send a single text to the 88810 number multiple "charge" premium texts arrived just to charge her, she had no idea that they would be so many.
All in all, however dubious this was not illegal, although they were very unclear as the exact amount they would charge. I ended up asking my mobile operator to disable all premium text messages to avoid the same happening in the future.
700035740 - Premium text received £1.50
700035740 - Premium text received £1.50
700035740 - Premium text received £1.50
700035740 - Premium text received £1.50
700035740 - Premium text received £1.50
88810 - Premium text £0.10
United Kingdom