Second SIM, Dual-SIM Phone, or Virtual Number: What Fits a Small Landlord?

Once you've decided tenants shouldn't have your personal mobile number, the next question is which second number to actually get. For a landlord managing a handful of properties, that usually comes down to three practical options — not two — and they trade off differently on cost, day-to-day hassle, and what happens once you no longer need the number.

A second SIM card

The most familiar option: a pay-as-you-go SIM or a cheap second contract, either dropped into a spare phone or swapped into your main handset when you need it. It's the lowest ongoing cost of the three, often just a few pounds a month for light use.

The trade-off shows up in daily use. A spare phone is another device to keep charged and remember to check; swapping SIM trays back and forth isn't something most people keep doing for long. And a SIM on its own has no concept of working hours — it rings whenever it rings, at 7am or 11pm, with nothing in between to route the call anywhere else.

A dual-SIM phone

Most modern phones support two active numbers at once (a physical SIM plus an eSIM, or two physical SIMs), so a second number can sit on the same handset you already carry — no spare device, no tray-swapping.

That solves the "which phone is it on" problem but not the boundary one: both numbers still ring the same phone, at the same hours, with no automatic rule to send the tenant line to voicemail after a set time. Quieting it for an evening means finding the setting and switching that line off yourself, then remembering to switch it back on. It also has a hard ceiling — once you're past two or three properties, a phone with two SIM slots runs out of numbers before your portfolio does.

A virtual number

A virtual landlord number, like TenantCall, forwards to the phone you already carry — no new SIM, no spare handset, no second line to manage on the device itself. The difference is what happens before a call reaches you: active hours, do-not-disturb, and an automatic text reply on a missed call (that reply needs a number that supports SMS, and keeps working as long as your monthly text allowance isn't exhausted) are rules the number itself enforces, rather than something you have to remember to do manually every evening.

It also handles things a personal number or a bare SIM plan simply has no mechanism for. Calls can be recorded, on a consent basis. Every call routed through the number — answered or missed, tenant or contractor or letting agent — is transcribed and filed against that property, so instead of trying to remember what was agreed on a call three weeks ago, there's a searchable record of every conversation tied to that address in one place. That's useful for everyday organisation (chasing up what a tradesperson actually said they'd do) and it's the kind of thing that matters a great deal more the one time a call ends up disputed.

And on plans that support it, if a call goes to voicemail outside your active hours, the caller can flag their message as urgent so it stands out from routine messages instead of getting buried among them — something a SIM card or a phone's second line has no way to do at all, since there's nothing behind either one but the number itself.

It also scales the way a portfolio does rather than the way a phone's SIM slots do — adding a property means adding a number to the same plan, not sourcing another SIM or another phone for it.

Comparing the three

Which one actually fits

If you have a single property, rarely get a tenant call, and don't mind manually silencing a line in the evenings, a second SIM or a dual-SIM phone can be enough — the cost is lower and the setup is something you already understand. Past one property, or once evening calls become a genuine annoyance rather than a rare interruption, the built-in hours, do-not-disturb rules, and a filed, transcribed record of every call routed through the number tend to save more day-to-day hassle — and leave you with more to fall back on — than a bare SIM or a dual-SIM phone ever will.

Getting started

Our pricing page breaks down what's included at each tier as your portfolio grows, and the Get Started page is the quickest way to ask which option fits your specific number of properties.