Back in late March, vivo unveiled the S1 with a Helio P70 SoC and a 24.8MP elevating selfie camera. Now, the Chinese phone maker has announced its Pro variant with better hardware. The vivo S1 Pro looks similar to the non-Pro model, but it has a Snapdragon 675 SoC under the hood, paired with 6GB or 8GB RAM. The former comes with 256GB of storage whereas the latter has 128GB of storage onboard. This, honestly, is a weird memory combo. Moving on, the S1 Pro is built around a 6.39-inch Super AMOLED notchless display that has a resolution of 2340 x 1080 pixels and an aspect ratio of 19.5:9....