From the BBC World Service… Simmering tensions around Huawei's participation in the rollout of 5G internet connectivity have thrown technology security into the global spotlight. We'll take you to world’s biggest meeting of mobile-phone providers in Barcelona, where the Chinese company will be working to boost its battered image. Then, with one tweet about progress on trade negotiations with China, President Trump helped send global stocks sharply higher today. But is there enough detail to sustain investor optimism?Today's show is sponsored by Kronos, Pitney Bowes and WellFrame.