Messaging + Essentials: what is included, and what is not
Prices last confirmed
This is the GigSky feature almost nobody writing about cruise eSIMs mentions, and it is the one that most changes how much data you actually need to buy.
Short answer
WhatsApp, iMessage, Apple and Google Maps, Uber, Lyft and text-only Gmail keep working without drawing down your plan allowance. Voice and video calls are NOT included, and neither are attachments — the message is free, the photo attached to it is not. Understood properly, this lets most people buy a materially smaller plan than they would otherwise.
What is included
The covered set is deliberately narrow and it is built around the two things people actually do at sea: staying in contact, and finding their way around a port they have ninety minutes in.
For staying in touch: WhatsApp and iMessage text messages, plus Gmail in text-only form. For finding your way: Apple Maps and Google Maps. For getting around: Uber and Lyft. Those last two matter more than they look. Booking a ride from a cruise terminal is one of the few genuinely time-critical things you do ashore, and it is the worst moment to find your allowance gone.
What is excluded, and why it catches people
Two exclusions, and both are the kind that people discover after the fact rather than before.
Voice and video calls are not covered. A WhatsApp text is free; a WhatsApp call is ordinary data, and video calling is the single fastest way to consume an allowance at sea. If your plan for staying in touch is a daily video call home, the Essentials feature does nothing for you and you should size the plan as though the feature did not exist.
Attachments are not covered. This is the subtle one. Sending "we docked, all fine" costs you nothing. Sending the photo of the harbour next to it is normal data. So is a voice note, which is an attachment wearing a different name, and so is a forwarded video. Families who agree to send photos through the day can burn a small plan while believing their messaging is free.
How to size a plan around it
Work out which of your usage is genuinely inside the covered set, and buy for the rest. For a lot of travellers that turns out to be a surprisingly small number.
If your pattern is text contact with family, maps ashore, and occasionally looking something up, the covered apps carry most of the week and a small Fixed plan handles the remainder comfortably. If your pattern includes photo sharing, social media, video calls or streaming, none of that is covered and you should size the plan against those alone — the feature is not going to rescue you.
The practical version: agree with whoever you are travelling with that photos wait for Wi-Fi in port or for the end of the trip. That one agreement does more to make a small plan viable than any other single decision, and it costs nobody anything except the immediacy of the picture.
How to check what is actually counting
You do not have to take any of this on trust. Both phone platforms report data consumption per app per line, and on a cruise that report is the only source of truth about where an allowance went.
On an iPhone, open Settings, then Mobile Data (Cellular in some regions), select the travel line, and scroll to the per-app list at the bottom. On Android the equivalent lives under Network and internet, then SIMs, then App data usage for the relevant line. Reset the statistics the morning you sail and you have a clean baseline for the trip.
Check it on the evening of your first sea day. Are the covered apps near zero while your total keeps climbing? Then something outside that set is eating the data. Usually it is photo backup, a podcast app refreshing, or system updates you deferred at home. Turn all three off before you sail, rather than finding out on day four.
The other reason to look is that it settles arguments. On a family trip, the person who swears they have only been texting is sometimes right. The per-app list is how you discover the real culprit was a tablet in a cabin nobody thought about.
Why this is the real differentiator
Cruise eSIMs compete on price per gigabyte and on how many ships they cover. Both are easy to compare. A feature that takes your most frequent usage off the meter altogether is harder to fit in a table, which is probably why it goes unmentioned. On a week-long sailing it can matter more than the headline rate.
It is also the honest counterweight to a criticism we make of maritime data generally: it is expensive per gigabyte compared with land plans. That is true. It is less relevant when the traffic you generate most often is not counted against the gigabytes at all.
Questions
01Does this mean WhatsApp is completely free at sea?+
Text messages, yes. Calls, voice notes, photos, videos and documents are all normal data. The rule of thumb that holds up: if it is words typed into the box, it is covered; if it is a file, it is not.
02Is Gmail really included?+
In text-only form. Reading and sending plain messages is covered; downloading or sending attachments is not, and neither is anything that quietly syncs images in the background. Turning off automatic image loading in the mail app makes the distinction behave predictably.
03Which plans include the feature?+
It is a property of the GigSky cruise plans rather than a separate purchase, including during the free trial. Check it against the specific plan at checkout before assuming, since the plan families do change.