FlexiFone vs Honest Mobile Smart SIM
Both are backup SIMs that use all four UK networks and switch automatically when your main signal drops. The difference is what the data can be used for — and whether you need calls, tethering and browsing as well as apps.
Which one is right for you
They solve the same problem in two different ways. Pick on what you’d actually do with the data
Choose FlexiFone if
You want a second line that does everything
- You want open data — browsing, streaming, social, VPN, anything
- You need UK calls and texts on the same line
- You want to tether a laptop or tablet
- You'd rather have a physical SIM, or need one for a router or IoT device
Choose Honest Mobile if
You only need a safety net for a handful of apps
- You only need messaging, maps and payment apps as a backup
- You travel widely outside Europe — their roaming list is longer
- You'd rather have no data cap at all, even a restricted one
- B-Corp and carbon-negative credentials matter to you
Side by side
The full comparison
Every Honest Mobile figure below was taken from their own published pages. Where we couldn’t source a claim, we left the row out.
The difference that matters
"Unlimited" isn't the same as open
Honest Mobile’s Smart SIM is unlimited in the sense that there’s no gigabyte counter — but it only works on a list of around 500 approved apps. WhatsApp, Google Maps, Uber, Citymapper and banking apps are in. Web browsing, social media, video streaming and VPNs are out, and there are no calls or texts at all.
That’s a reasonable trade if you only want a safety net for messaging and navigation. It isn’t, if your phone drops onto the backup line mid-journey and you wanted to answer email, join a video call, or tether a laptop.
FlexiFone works the other way round: a normal data allowance you can spend on anything. 5GB to 100GB a month, no approved-app list, unrestricted tethering, and UK calls and texts if you pick a voice & data plan.
Why FlexiFone
What you actually get.
No approved-app lists, no single-network lock-in, and no contract to sit out.
Open data, not a list. Your allowance works on anything — email, browsing, video calls, streaming, a work VPN. There’s no approved-app list to check before you rely on it.
Calls and texts if you want them. Voice & data plans start at £10/mo with 100 UK minutes. A backup line that can’t make a phone call is only half a backup.
Tether anything. Unrestricted hotspot on every plan, so a laptop or tablet gets online through your phone.
Beyond phones. Physical SIMs for £3.50, and support for tablets, 4G/5G routers, cameras and trackers with a manual APN.
Pricing compared
What £45 a year buys
Flexifone and Honest Mobile, both land on exactly the same headline price. What you can do with it is where they part company.
Same headline price. The question is whether a capped-but-open allowance suits you better than an uncapped-but-restricted one.
FAQ
Flexifone Vs Honest Mobile - Most Asked Questions
No. Plans run 5GB to 100GB a month. We’d rather give you a clear number you can spend freely than an unlimited badge with a list of exclusions.
No. Your data works on anything, including VPNs and streaming.
On FlexiFone yes, with a voice & data plan. Honest Mobile’s Smart SIM has no calls or SMS; their Classic SIM does, but it’s a single-network plan on Three from £12.15/mo.
FlexiFone — unrestricted on all plans. Honest Mobile’s Smart SIM doesn’t offer it.
Yes, both are secondary SIMs — though phones hold a limited number of active eSIM profiles at once.
