Could I use this cable for my iPhone 6s plus?

Yes, this is one 8 pin lightning connector for helping you charge your iPhones.

will the plugs fit into any phone with the phone case on? i.e. S7 with protective case.

It is made to fit the phone, not a case.

Does this cable support data transfer and syncing for iPhone (running iOS 11.3) in addition to charging?

It could help both charging and data transferring/syncing for iPhone with 8-pin lightning port.

can it charge the galaxy s8?

We check it with S8 before shipping and it worked. Thanks for your question, we will trying to improve our products and offer better and better products to every customers.

Micro USB Cable, 2 Pack 3-in-1 Retractable Lightning to USB Cable Type C Sync Fast Charging Cord for iPhone, iPad Mini/Pro/Air, Samsung, Moto, Blackberry, Nokia, LG, Google, HTC (Black)

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