The Voyager was built with Cat5 cabling in place so is easier for upgrading to WI-Fi, which has been carried out and the suites are near enough all WI-FI.

The Mariner was not so lucky and as the process of wiring the ship for "Wireless" is quite disruptive (Bulkheads and ceilings have to be dismantled, etc.) it is highly unlikely the Mariner will ever gor all Wireless.

However, I have heard there are plans to increase the number of WI-FI hotspots around the ship (Pool Deck, Horizon Lounge, etc.) and the top 4 suites will also be connected.