‘Read about Ovivo through HUKD and like others questioned it first, I went on their Facebook account and asked some questions and got an answer within 30 minutes which was very good and put my worries to rest.
I was originally with Three and had a very bad customer service experience with them but Ovivo should rent out their CS trainer as the help I received from Ovivo was second to none!! Excellent.
I used to pay £15.00 a month for 300mins/texts & 750mb, I barely used my allowance at all, now I pay £0.00 a month and a smile on my face 
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Thanks Ovivo’