LONDON (Reuters) - British network Three is rolling out 5G mobile to major cities including London, Glasgow and Birmingham from the end of the month, joining its larger rivals in offering next-generation services on new 5G-enabled handsets.Three, owned by Hong Kong's Hutchison , launched a 5G home broadband product in central London last year, but Chief Executive Dave Dyson said he wanted all elements of the network, including its cutting edge "cloud core", fully functioning before moving onto..