Using an eSIM in Christchurch

What Christchurch is like on a phone

Christchurch is flat, easy to cycle and rebuilt in large parts over the past decade or so. Few people come only for the city itself; most are here to collect a rental car or a camper and start a loop of the South Island, which makes the place a staging post more than a destination. Across the centre and the surrounding suburbs the line is consistent — enough to work online or plan a route from a cafe. What is worth bracing for is the quiet ahead, because the roads leading west and south run into country where there are few people and, unsurprisingly, little coverage.

When you land

Christchurch Airport (CHC) handles international and domestic flights in one building, so a connection is a walk within the same terminal once you have cleared arrivals. Switch the eSIM on as you touch down, because the first thing most people do after immigration and biosecurity is contact a car or camper rental desk — some of which sit off-site and are reached by a shuttle. City buses pick up from the marked stops out front and ride apps work normally. The run into town is a straight road through residential suburbs with service the whole way, which makes it a good moment to download the map area for your first driving day.

Where coverage changes

Across the city, through Hagley Park and Riccarton and out to Sumner on the coast the line runs without interruption, including the drive over the hill to Lyttelton — the tunnel takes it away and hands it straight back at the far portal. Head north along the coast towards Kaikōura and some sections cling to cliffs above the sea with short blank spots. The clearest contrast is the crossing to Arthur's Pass: once you are in the ranges, coverage exists in patches around the settlements and rest areas with long silences between them. The inland routes towards the lakes and the high country behave the same way, with long stretches of nothing at all. Download the map for every leg before you leave the last town.

What a day here costs in data

A city day — cycling between museums and gardens, sitting in a cafe planning the route — usually sits around a gigabyte or a little more. A driving day looks nothing like it: navigation runs for hours, accommodation gets searched for on the move, and many people stream music or a podcast to stay alert. Families driving together tend to tether so the kids can watch something in the back, and that is the single biggest consumer on a trip like this. If there is going to be in-car video, download it at the accommodation the night before and keep the mobile line for maps, bookings and staying in touch.

Districts travellers ask about

• Central city and the Avon riverside — New buildings, restaurants and the river path sit together, and the line is good throughout. A practical place to sit down, plan the route and download several map areas in one go before you set off.
• Riccarton and Hagley Park — A large shopping district beside a very big park that people cycle through all day; the line is fine inside the malls and out on the grass. A sensible stop for stocking up and running through the checklist before a drive.
• Sumner and the coast — The beach locals drive out to for weekend coffee; the road and the sand are normal to use, while the tracks climbing the cliffs above the bay soften in pockets along the rock.
• Lyttelton — An old port town on the far side of the hill, reached through a tunnel where the signal simply stops and resumes at the other end. The town works well, while the road along the crater rim above it rises and falls depending on which way the slope faces.

Day trips out of the city

• Akaroa and Banks Peninsula — The road climbs the crater rim and drops into a deep bay, cutting out in the folds and returning at the lookouts. The village itself is usable, while a boat tour out into the harbour thins as you move away from the shore, so download any booking before you step aboard.
• Arthur's Pass and the alpine crossing — Once you are in the mountains, coverage exists in patches around the settlements and rest areas and genuinely disappears for long stretches between them. Load the map for the whole crossing and save your destination accommodation beforehand. The same applies if you take the train: the views are the point, and you will be out of contact in sections. Winter road conditions change quickly, so check the official notices before you leave.
• Lake Tekapo and Aoraki — The high country is open but remote, with service clustered at the lakeside villages and service areas and long roads between them where there is none. If you are out for the night sky, save the route back to your accommodation in advance and carry a torch and a power bank, because night photography drains a battery fast.