Is there coverage out at windswept Guincho beach?

Generally yes. Guincho is exposed and a little way from town, so data can be a touch weaker among the dunes, but you'll usually get enough for surf forecasts, maps and ride-hailing back into Cascais.

Can I use one eSIM for Cascais, Sintra and Lisbon day trips?

Yes. It's a single national Portugal plan, so the same eSIM covers Lisbon, the Cascais coast and the hop over to Sintra, with no switching as you move between train, bus and taxi.

Cascais eSIM.

Name: Cascais travel eSIM
Brand: My Holiday SIM

Cycle the Cascais seafront to wild Guincho beach and watch waves erupt at Boca do Inferno.

from $2.15/day · unlimited dataAll of Portugal →

Unlimited data5G where availableInstant QR by emailKeep your number

1 · How many days?

10 daysOther:days

2 · How much data?

3GBBest pricevalid 15 days$4.60$0.46/day

Cheapest plan covering your trip: 3GB, valid 15 days.

Travellers (one eSIM each)

1 × 3GB (valid 15 days) · 10-day trip$4.60

Good to know in Cascais

Cascais links to Lisbon by the scenic Linha de Cascais coastal train, which hugs the shore for 40 minutes. Signal stays strong the whole way, so stream or map freely, and grab a right-hand seat for the ocean views.

Two simple ways to buy

Cascais eSIM plans: unlimited, or by the GB.

Every Cascais eSIM from My Holiday SIM is one of two straightforward types. Pick whichever fits how you travel in Cascais — you can always top up or switch on your next trip.

Traveller streaming and browsing freely on an unlimited-data travel eSIM

Unlimited plans

High-speed data, nothing to count

Priced per day — the longer you stay, the better the daily rate. Ideal for streaming, hotspot and longer trips where you'd rather not watch a data meter. A fair-use policy keeps speeds fast for everyone; see each plan for the detail.

Best for streaming, video calls & hotspot
Great for longer or open-ended trips
One price per day — no GB anxiety

By-the-GB plans

3GB10GB20GB

A set bundle, brilliant value

A fixed data allowance (say 3 GB or 10 GB) valid for your travel days. The best-value pick for lighter trips built around maps, messaging and a bit of browsing. Running low? Top up in a couple of taps — nothing to reinstall.

Best value for lighter, shorter trips
Clear allowance — pay only for what you need
Top up any time from your phone

Compare plans →Not every destination has both types — the picker shows what's available where you're headed.

Plan your data

How much data do you need in Cascais?

A rough, honest guide to sizing your Cascais eSIM so you're not guessing. Most travellers in Cascais are comfortable on 3–5 GB a week — heavy streamers just go Unlimited.

Traveller checking maps and messages on her phone using a My Holiday SIM eSIM

Not sure? Start with a 5 GB plan — you can top up in seconds if you run low.

Light

~1 GB / week

Maps, messaging & email

Google Maps, WhatsApp, email and the odd search. Plenty for a city break where you mostly need directions.

Suits 1–3 GB plans

Balanced

3–5 GB / week

Everyday holiday use

Everything above plus social scrolling, music, cloud photo backups and a little video. Where most travellers land.

Suits 5–10 GB plans

Cascais eSIM: your local data guide.

Once a fishing village, Cascais now blends a pretty marina, palm-lined beaches and the windswept dunes of Guincho, all strung along the coastal train from Lisbon. A Cascais eSIM keeps cycle-route maps, surf-forecast apps and seafood-restaurant bookings running as you ride out to Boca do Inferno or catch the sunset at Praia do Guincho.

One eSIM for Cascais and all of Portugal. It's the national Portugal eSIM — from $2.15/day with unlimited data, working the same in Cascais as it does the moment you leave it.

Landing at Lisbon Airport (Humberto Delgado, LIS)?

Install the QR at home, then switch the eSIM on as you taxi in — you're online before you reach the arrivals hall.

Cascais eSIM pricingbest-value plan · per day

Days

Per day

Total

Saving

3 days1GB

$0.81

$2.43

—

5 days1GB

$0.49

$2.43

−40%

7 days1GB

$0.35

$2.43

−57%

10 days3GBPopular

$0.46

$4.60

−43%

15 days3GB

$0.31

$4.60

−62%

30 days5GB

$0.20

$6.14

−75%

Each trip length shows the best-value plan that covers it. Total always shown before you pay.

eSIM vs the old ways in Cascais

eSIM

ROAMING

AIRPORT SIM

Data allowance

Unlimited

Usually capped

Rarely unlimited

Price known upfront

Prepaid

Billed after

Varies at the desk

Ready when you land

Instantly

After the queue

Keep WhatsApp number

SIM swapped

Cascais eSIM from $2.15/day — the whole bill, agreed before you fly.

On the ground

Where you'll lean on data in Cascais.

Marina & Old Town

Reserve a table for grilled fish, translate the day's catch and navigate the cobbled lanes around the Cidadela.

Praia do Guincho

Check live wind and surf forecasts before the exposed Atlantic beach, then call a ride back when the bus is scarce.

Boca do Inferno

Time your visit to the sea cliffs with the tide tables and share the dramatic blowhole shots straight away.

Estoril

Ride the coastal train from Estoril, look up casino show times and map the promenade back towards Cascais.

The practical bit

Getting around Cascais on your eSIM.

Apps you'll want online in Cascais

MobiCascais— The town's all-in-one app for buses, bike hire and parking; needs data to use.
CP - Comboios de Portugal— App for the coastal Cascais line from Lisbon's Cais do Sodre; check times over data.
Bolt— Ride-hailing for hops to Guincho beach or Boca do Inferno; book and pay over data.
Google Maps— Maps the seafront promenade walk to Estoril and the cycle paths; live routing needs data.

How long to stay in Cascais

Many treat Cascais as a half- or full-day coastal escape from Lisbon, though two nights let you slow down for the beaches, the marina and nearby Guincho.

How much data for Cascais

Light beach days need only about 1 GB for the train app, maps and a few sunset posts; step up to a balanced 3-5 GB if you're basing yourself here and commuting into Lisbon.

Coverage in Cascais

The town centre, seafront promenade and Cascais rail line hold strong 4G/5G across all networks; signal softens on the exposed Guincho dunes and the cliffs around Cabo da Roca and Boca do Inferno.

Where you're headed

Discover Cascais.

Cascais, Portugal — skyline and landmarks · stay connected with a Cascais eSIM from My Holiday SIM

Cascais, Portugal — streets and everyday scenes · stay connected with a Cascais eSIM from My Holiday SIM

Cascais, Portugal — sights worth exploring · stay connected with a Cascais eSIM from My Holiday SIM

Cascais, Portugal — a travel moment · stay connected with a Cascais eSIM from My Holiday SIM

How to activate your Cascais eSIM.

Full installation guide →

A traveller happily planning her next trip with a map and phone

Buy your plan

Choose your days — the QR code arrives by email in seconds.

A traveller installing her eSIM from the sofa in two minutes

Install at home

Scan the QR on Wi-Fi before you fly. About two minutes, no app needed.

Friends laughing together while packing for a holiday

Fly relaxed

Nothing counts down yet — your days start only at first connection.

A joyful family reunion at the airport arrivals hall

Switch on in Cascais

Turn the line on when you land. Connected before baggage claim.

New to eSIM in Cascais?

What is a Cascais eSIM?

A Cascais eSIM is a digital SIM that's already built into your phone. Scan one QR code and a local Cascais data plan installs alongside your home SIM — no plastic, no tray tool, no swap. Your number and WhatsApp stay exactly where they are.

✓ 2-minute install✓ Keep your number✓ Works on phones from 2018+

How eSIM works →Check my phone

A traveller with a backpack smiling at her phone — online abroad with My Holiday SIM

Connected · 5G

Home SIM · calls & WhatsAppHoliday eSIM · unlimited data

30-day refund promiseUnused, uninstalled eSIM? Full refund, no questions.

The price is the billPrepaid and final — roaming charges can't happen.

Days start when you landInstall early with zero pressure; counting begins at first connection.

Humans, 24/7Real people answer, before, during and after the trip.

Peace of mind

Your Cascais eSIM: data-only, zero bill shock.

Your Cascais eSIM handles the internet while you travel. Your home number stays exactly where it is — no surprise roaming charges in Cascais, no swapping your real SIM out.

Keep your number & WhatsApp

The eSIM is data-only and runs alongside your home SIM. Your number, iMessage and WhatsApp keep working exactly as they do at home.

No roaming bills, ever

Turn data roaming OFF on your home SIM and ON for the eSIM. You pay once, up front — no overage, no metered surprises, no bill waiting when you land home.

One thing worth knowing

Because it's data-only, the eSIM can't receive bank verification (OTP) text codes — those still go to your home number. Keep it reachable on Wi-Fi calling, or use app-based codes.

Traveller relaxed and connected on her phone, no roaming bill to worry about

Why travellers choose My Holiday SIM for Cascais.

Instant eSIM deliveryQR code in your inbox seconds after checkout — even at the departure gate.

No physical SIMNothing to collect, lose or poke out with a paperclip. Your home SIM stays put.

Keep your WhatsApp numberData flows through us; WhatsApp stays on your home number. Family always reaches you.

A traveller at the departure gate, eSIM ready on her phone

eSIM ready in ~2 minutes

No bill shock, everOne clear price before you fly. Roaming charges simply can't happen.

Secure paymentsCards, Apple Pay, Google Pay, PayPal and Klarna — encrypted end to end.

Real human supportReal people — before, during and after your trip. Live chat and email, no bots. Easy top-ups too.

Coverage in Portugal.

5G where available, fast 4G everywhere else

Connected · 5G

Your eSIM joins Portugal's partner networks automatically — no settings to choose, no manual network hunting. If signal drops in a remote spot, toggling Airplane Mode for a few seconds forces a fresh connection.

MEO
Vodafone Portugal
NOS
Digi

Popular places covered

LisbonPortoSintraCascaisFaroLagosAlbufeiraCoimbra

Keep data roaming ON for the eSIM line only — that's the switch travel eSIMs use, and it never adds charges on our plans.

Trusted networks, honest numbers.

No invented star ratings behind your Cascais eSIM — just the numbers we actually stand behind.

Friendly globe with location pins — coverage on every continent

My Holiday SIMSTAY CONNECTED. ANYWHERE.

200+

destinations — every continent covered

regions covered by a single regional eSIM

~2 min

typical install — QR to connected

Live

chat & email support

Before you fly

Cascais eSIM questions, answered.

Yes. The Linha de Cascais runs above ground along the coast, so you keep data the entire 40-minute ride from Cais do Sodre, ideal for maps, messages and planning your first beach stop as the Atlantic rolls past.

Your Cascais eSIM glossary.

eSIMA SIM built into your phone's hardware. Plans install onto it digitally — no plastic card involved.

QR profileThe code we email you. Scanning it downloads your holiday plan onto the eSIM. One scan per device.

Data roaming (the switch)The toggle travel eSIMs use to join partner networks abroad. On our plans it never adds charges — keep it ON for the eSIM, OFF for your home SIM.

Hotspot / tetheringSharing your phone's data with laptops and tablets. Included on our plans wherever networks allow.

Top-upExtra days added to a live plan from your account. They append to the end — nothing overlaps.

First connectionThe moment your eSIM first joins a network at the destination — that's when your days start counting, not before.

Travelling wider in Portugal?