What actually happens if you just stop using it?
A prepaid Israeli line left idle expires. Operators reclaim numbers that go unused for roughly six to twelve months and reissue them to new customers. A postpaid line lasts as long as you keep paying, and disappears when the direct debit is cancelled — usually by someone tidying up finances long after the move.
Nothing warns the services that hold that number. Your bank, Bit, Kupat Cholim, gov.il, your insurer and your Israeli logins all still have it on file, and they carry on sending codes to a number that now belongs to somebody else, or to nobody. You discover it one by one, each time you need to log in.
Recovering from that is disproportionately hard. Changing the number on file at an Israeli bank is itself verified by SMS to the old number, so losing the number can lock you out of the process for replacing it. That circularity is the real cost, and it is invisible on the day you decide to cancel.
Should I keep the number or let it go?
Keep it if anything Israeli is still attached to you: a bank account, a pension, a mortgage, property, Bituach Leumi, a Kupat Cholim membership, an Israeli employer, or family whose services list you. That is most people who have lived there, including plenty who consider the move permanent.
Let it go only if you genuinely have nothing left — no account, no portal, no likelihood of returning. Even then, be aware that opening anything Israeli later will want an Israeli mobile number, and a number you have held continuously is far easier than a new one you have to register everywhere from scratch.
The cost of keeping it should not decide this. Held as an inbound-text line whose messages are delivered to your inbox, an Israeli number runs from $14.99/month — less than most people were paying for the phone plan they cancelled, and a fraction of what recovering from a lost number costs in time.
How do I keep it without paying for a full phone plan?
Port the number you already have onto a line built for exactly this. Porting keeps the number itself — the one every Israeli service already has on file — which is the whole point, because it means nothing needs updating anywhere.
From there the line stops behaving like a phone and starts behaving like a mailbox. It does not roam, makes no calls and sends no texts, so it costs almost nothing to run; incoming texts are forwarded on the network and arrive in your email within seconds of being sent, wherever you are.
And the number stays yours for as long as the line is active — it will not expire underneath you the way an idle prepaid line does. If you visit or move back, the same number becomes an ordinary Israeli mobile again the moment you put the SIM in a phone, with everything still pointing at it. Keeping an Israeli number from abroad covers the setup.
The timing that actually matters
Do this before the number lapses, not after. A number that still exists can be ported in a few business days and keeps working throughout. A number that has expired is usually gone permanently — Israeli operators reissue released numbers, and there is no mechanism for getting a specific one back.
If you are still in Israel and about to leave, that makes this a pre-flight task rather than a someday task. If you have already left and the line is still alive, it is urgent in a way it does not feel: you are inside a window that closes quietly.
If the number has already gone, it is not a catastrophe — a new Israeli number still solves the ongoing problem, and keeping an Israeli bank account from abroad covers updating the services that need to be told.
Quick answers
How long before an unused Israeli number expires?
For prepaid lines, typically six to twelve months of no activity, though the exact rule varies by operator and can change. A postpaid line survives as long as it is being paid for, and ends when the payment does. Neither gives you a warning that is likely to reach you abroad, and neither notifies the banks and services holding the number. The practical takeaway is that the window is shorter than most people assume and closes without any signal.
Can I port my Israeli number if I have already left the country?
Yes, as long as the line is still active — porting is done remotely and does not require you to be in Israel. What you need is the number still being live with its current operator and the account details to authorise the transfer. The port itself takes a few business days, and the number keeps working while it happens. Once a number has actually expired and been released, though, porting is no longer possible.
Is it worth keeping the number if I am never moving back?
It depends entirely on what is still attached to it rather than on your travel plans. If you hold an Israeli bank account, pension, property, Bituach Leumi record or Kupat Cholim membership, those relationships continue whether or not you return, and each of them verifies you by SMS. Plenty of people who left permanently still need to log into an Israeli bank a few times a year, and the number is what makes that possible.
What if I want the number to work as a normal phone when I visit?
It does. The line is a real Israeli mobile — while you are abroad it simply is not attached to any network, because it does not roam. Put the SIM or eSIM into a phone in Israel and it behaves like an ordinary Israeli line, with calls, texts and data on the local network, using the number you have kept all along.