Every middleman slows the update process down. Nexus devices get the Android updates first, then unlocked phones and then telekom provider. Some phone manufactu

Every middleman slows the update process down. Nexus devices get the Android updates first, then unlocked phones and then telekom provider. Some phone manufactures are known to provide updates faster than others or at all, some provide it only for a few weeks. It's all your choice with Android. If you want/need a very good signal quality, buy one made of mainly of plastic instead of metal material; or an external antenna. The brand doesn't matter that much.