Pixel 4, 4 XL and 4a eSIM — including the one in your drawer

All three, yes

The Pixel 4, Pixel 4 XL and Pixel 4a support eSIM, and each keeps a nano-SIM tray. A travel profile installs on any of them without ceremony.

Compatibility, then, is not the interesting part of this page. The 4a in particular has become one of those phones people keep long after they stop using it daily, and a phone with a working eSIM that you no longer rely on is more useful than it sounds.

The spare-phone idea

Put the travel eSIM on the old 4a rather than on your current phone, and use it as a pocket hotspot.

What that buys you:

• Your main phone never changes configuration. No profiles to add, nothing to undo when you get home.
• Your home SIM stays where it is, reachable, with data roaming off.
• If a phone gets stolen at a night market, it is the old one with nothing on it.
• Everyone in your party shares one data plan rather than buying four.

What it costs you: a second thing to charge, a second thing to carry, and a device you have to remember to switch on. For a couple or a family it usually pays. For one person travelling light it often does not, and the dual-SIM setup on your main phone is simpler.

Check the plan's terms before committing to this. Tethering is allowed by many travel eSIM providers and restricted by some, and a plan that forbids it makes the whole arrangement pointless.

The battery is the constraint, not the modem

A 4a running as a hotspot is doing the one job that flattens phones fastest: radio on, screen off, continuously serving other devices. On a battery that has been through several years of charge cycles, expect hours rather than a day.

Plan for that. A power bank makes the spare-phone approach work; without one it fails by mid-afternoon and you end up buying a second plan for your main phone anyway.

There is a cheaper version of the same trick that avoids the problem: leave the 4a switched off in the bag and treat it as a backup rather than a hotspot. If your main phone is lost, drowned or drained, you have a second device with a working data plan and your accounts one login away. That costs no battery at all until the day you need it.

Buying a used 4a for exactly this

They are cheap now, and cheap enough that a dedicated travel phone stops being an indulgence. Two things decide whether a given unit is worth it, and neither is the eSIM, which is present on all of them.

The first is whether it is carrier-locked, because a lock rejects third-party eSIM profiles regardless of hardware. Ask the seller directly and treat a vague answer as a no.

The second is the battery, which on a phone of this age is the part that has actually aged. A unit with a replaced battery is worth noticeably more than one without for this purpose, whatever the listing price suggests.

If it is your only phone

Then use both lines. Home SIM in the tray for calls and SMS, travel eSIM as the data line, and data roaming switched off on the home line so it cannot quietly bill you in the background. That last step is the one people skip.

A short pre-flight list

Update Android while you still have wifi. Delete any eSIM profile left over from a previous trip so you are not staring at two entries wondering which is live. Install the new profile at home. And confirm the handset is not still carrier-locked from whatever deal it was bought on — a lock will block a third-party eSIM even though the hardware is willing.

The compatibility checker covers the rest of the Pixel range if you are deciding which old phone to press into service.