Huawei Activa 4G is fifth 4G LTE smartphone from the nation’s only no-contract 4G LTE provider.   MetroPCS Communications, Inc. (NYSE: PCS) and Huawei, a leading global information and communications technology (ICT) solutions provider, are making 4G LTE service available to all MetroPCS customers with the introduction of the Activa™ 4G smartphone. The Activa 4G…