Ringgo has numerous customer service issue which need to be address immediately including the new user registration process and the phone payment process. Failure to address these issues subjects potential users to parking penalties/fines/tickets or they just can't park in the Ringgo territories. For example, on a recent trip to the U.K.: I attempted multiple times to register for the RingGo app however it did not accept my U.S. mobile phone number even though I tried all possible ways (without country code, with +1, with 01, with 001, every possible combination). This apparently is a longstanding and well documented problem with RingGo. I also attempted to use their phone number service (including the help number xxxx-0010) at least 10 times. When asked for the car's make (using only 1 word) it would not accept my answer of "Mercedes", or my one word answer on color "Black". This is also seems to be longstanding and well documented problem with RingGo. I strongly urge RingGo to fix this problems.