I have had many issues with RWG Mobile over the past few months including billing errors, and there is no customer service at all. I recommend going to the communications ombudsman website to get issues resolved, use the drop down to enter RWG and let them know of your issues. They can get issues corrected and even get you compensation.
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From bespoke hardware, multiple profiles, a 4G network, Welsh language services and a comprehensive international roaming footprint RWG provides the full spectrum of services you would expect from a mobile network but with a friendly and personal approach.