In addition, they feature new gaming tech and a rear camera that should cope better in low-light conditions.
Their overall design, however, is similar to the Galaxy S6 line-up. Some experts suggested that could pose a challenge.
"Although there are significant improvements under the bonnet with the camera, the chipset, the removable storage and the water resistance, Samsung will have to make sure that`s visible to consumers," commented Ian Fogg from the IHS Technology consultancy.
"Because at a glance they look to be the same as last year`s model."
Samsung does not disclose smartphone sales numbers. However its share of the market dropped by 2% in 2015, according to research firm IDC, at a time when Apple, Huawei and Xiaomi made gains.
Even so, IDC`s data still indicates the South Korean firm remains the bestselling brand by a wide margin.
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