When should I install my travel eSIM?
Short answer. Install it on Wi-Fi a day before you leave. For most plans the validity period starts only when the eSIM first connects to a network in the destination, not when you install it, but check the plan's own policy first.
When does the validity period start?
| Provider | What starts the clock | Source |
|---|---|---|
| Airalo | For most packages, connecting to a supported network in the coverage area. A few packages start at installation, even outside the coverage area. Check "Validity Policy" in Package Details. | Airalo Help |
| Holafly (trip plans) | Arriving, turning on data roaming and connecting to a local network. Holafly notes iOS 16.4+ may combine install and activation. | Holafly FAQ |
| Holafly (monthly plans) | Purchase. Valid 30 days from payment and renews automatically. | Holafly Plans |
| Saily | Its plan pages say all plans have a 180-day activation period: if you don't activate within 180 days of purchase, the plan activates automatically. | Saily plan page |
Is there a deadline to use a plan after buying it?
Sometimes. Airalo says some eSIMs must be in use within a set period after purchase or they are "recycled" and can no longer be used. Saily's limit is the 180 days above.
What if my home country is inside the plan's coverage?
Holafly advises waiting until the day of the flight to install regional or global eSIMs in that case, because the eSIM may connect at home and start counting.
Does the data spread evenly over the days?
No. Airalo: a 1 GB, 7-day package gives 1 GB for the whole week, usable on day one if you want.
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Sources
- Airalo Help: When can I use my eSIM?
- Airalo Help: How do data amounts and validity periods work?
- Airalo Help: When should I buy my eSIM?
- Holafly FAQ: When to activate your eSIM
- Holafly FAQ: When does my eSIM activate, and when does it start?
- Saily: eSIM Japan plan page ("All plans have a 180-day activation period")