L'équipe Texto SMS Gratuit
2 October 2026 · 11 min read
Introduction: 300 GB for an 11 GB habit
The sales pitch has become mechanical. You compare three plans, and the third one advertises "300 GB on 5G" for two euros more than the 100 GB option. Two euros to triple your allowance: at that price, refusing would be absurd. You sign.
Six months later, your account dashboard shows a crystal-clear history: 9 GB in April, 13 GB in May, 11 GB in June. So you've paid €24 over the year for 289 GB nobody ever touched, and which don't roll over from one month to the next. Unused gigabytes aren't deferred savings: they simply vanish on the 1st of the following month.
This gap isn't an accident, it's a business model. An extra gigabyte costs a carrier almost nothing on a network that's already been built, while it works wonders on the shelf: it's the easiest figure to compare, and therefore the easiest to inflate. And in 2026, in a French market that's reshuffling itself and where the average price of data is rising for the first time in a decade, this volume arms race mainly serves to mask the price increases on entry-level plans.
This guide does the opposite of the usual comparison site. We're not looking for the plan with the most gigabytes: we're looking for the allowance you actually need, measured against your own data, plus a reasonable safety margin — and not one gigabyte more.
What a French subscriber really uses
Let's start with the context. Arcep, the French telecoms regulator, publishes a quarterly mobile market observatory that includes average data consumption per active SIM card. The order of magnitude in France hovers around fifteen gigabytes per month per subscriber — rising steadily year after year, but nowhere near the inflation of commercial allowances, which have gone from 50 to 300 GB over the same period.
In other words: the national average uses roughly 5% of a 300 GB plan.
That average obviously hides enormous variation. Three profiles come up again and again:
| Profile | Dominant usage | Typical monthly consumption |
|---|---|---|
| Light usage | Messaging, email, browsing, maps, a little music | 2 to 8 GB |
| Average usage | Social media with video, daily audio streaming, a few episodes on the go | 10 to 30 GB |
| Heavy usage | Regular tethering, video streaming off Wi-Fi, remote work on 4G/5G | 60 to 200 GB |
The key point: the difference between these profiles almost never comes from "how much I look at my phone," but from two technical variables — the share of your time spent off Wi-Fi, and whether or not you use tethering. A heavy TikTok user connected to Wi-Fi 20 hours a day uses less mobile data than a driver listening to three hours of podcasts in the car.
Step 1: read your actual consumption over three months
Before any decision, you need a number. Not an impression, a number. Two sources exist, and they don't say the same thing.
The authoritative source: your carrier account
It's your carrier's meter that triggers overage charges, so that's the one that counts. In the app or web portal of Orange, SFR, Bouygues, Free and their low-cost brands, you'll find a monthly consumption history, generally covering the last six to twelve months. Note the values for the last three complete months, then take:
- the median (the middle month) as your baseline;
- the maximum as your peak indicator.
Avoid reasoning from a single month: August and December, travel-heavy months, are systematically atypical.
The explanatory source: your phone's statistics
Your phone, for its part, tells you where the data goes, app by app. On Android: Settings → Network & Internet → SIM → App data usage. On iPhone: Settings → Cellular, with the list of apps and their volume since the counter was last reset.
Watch out for two reading traps:
- The iPhone counter does not reset automatically at the start of your billing cycle. If it's never been zeroed, it sometimes accumulates two years of usage. Reset it on the day your plan renews, then read it again a month later.
- Your phone's figures and your carrier's always differ by a few percent (counting methods, signalling traffic, rounding). Use the phone for diagnosis, the carrier for the decision.
Step 2: identify the four culprits that inflate the meter
In virtually every case we come across, abnormally high consumption boils down to four causes. Here they are, in order of frequency.
1. Autoplaying video
News feeds that launch videos on their own are, by a wide margin, the number one culprit. A video stream in standard definition uses roughly 0.5 to 1 GB per hour; in high definition, you easily climb to 2 or 3 GB per hour. Thirty minutes of scrolling per day in HD, off Wi-Fi, is enough to rack up 30 to 45 GB a month.
The useful setting exists in all the major apps: restrict autoplay to Wi-Fi, and cap quality on mobile data. In video streaming apps, look for "download quality" and "cellular data playback."
2. Tethering
This is the most brutal multiplier. As soon as a laptop goes through your phone, it behaves as though it were on a fixed connection: system updates, cloud backups, video calls. A single afternoon of remote work over tethering can burn through 10 GB.
If tethering is occasional, disable your computer's automatic backups before connecting. If it's regular — frequent travel, a second home, a worksite — the smart move isn't buying 200 GB on your main line: it's often a 4G LTE dongle or a small mobile router with its own data SIM, which isolates that usage and avoids penalising the whole family's line.
3. Automatic backups and syncing
Photos, videos, documents: cloud syncing is designed to be invisible, and it is — until the bill arrives. A weekend of photos and 4K video adds up to several gigabytes. Check in your backup service's settings that uploads are restricted to Wi-Fi, and do the same for app updates.
4. Weak Wi-Fi that switches you over to data
This one is insidious. When your home Wi-Fi is weak in one room, Android and iOS automatically switch to mobile data to maintain the connection — that's the "Wi-Fi Assist" or "Automatically switch to mobile data" option. The result: you think you're on Wi-Fi while your allowance melts away.
If the problem is permanent in a bedroom or at the far end of the garden, the fix isn't telecom but domestic: a mesh Wi-Fi repeater or a Wi-Fi powerline kit costs less than upgrading your plan, and treats the symptom at the source. And on a smartphone with poor reception everywhere, check the case too: some thick cases with a metal plate genuinely degrade reception.
Step 3: calculate the allowance you need
You have a median and a maximum. The sizing formula is simple:
Target allowance = highest consumption of the last three months × 1.5, rounded up to the next commercial tier.
The 1.5 coefficient covers seasonality (holidays, moving house, a broken router) without funding thin air. A few concrete examples:
| Max recorded over 3 months | Target allowance | Tier to aim for |
|---|---|---|
| 4 GB | 6 GB | 10 to 20 GB plan |
| 12 GB | 18 GB | 20 to 40 GB plan |
| 28 GB | 42 GB | 50 to 60 GB plan |
| 70 GB | 105 GB | 100 to 150 GB plan |
Two corrections to apply before concluding:
- If you don't have a fixed connection at home, the logic doesn't hold: your phone is replacing a router, and very large allowances then make real sense. Still, compare with a dedicated 4G/5G home broadband offer, which is often better suited.
- If you travel within the European Union, check the volume usable while roaming: it's almost always capped well below the domestic allowance. A 300 GB plan may only unlock 25 GB in Europe. In that case, it's that second figure that should guide your choice, not the one in the advert.
Step 4: protect yourself from overage charges without overpaying
The psychological argument for a big plan is the fear of going over. It's legitimate: outside your allowance, each megabyte billed is still expensive, and nasty surprises come quickly. But free protections exist, and they're more effective than permanently oversizing your plan.
- Your phone's data cap. Android lets you set a warning and a hard limit that cuts off mobile data at a threshold you choose (Settings → Network & Internet → Data Saver / Data warning & limit). iOS has no native equivalent, but its carrier notifications play a similar role.
- Carrier alerts. All French carriers send an SMS at 80% and then 100% of your allowance. Check that they're enabled on your line, and that the contact number is correct.
- Choose "blocking" over "automatic top-up." Beyond the allowance, some plans offer either free reduced speeds or the automatic sale of paid top-ups. The first option is almost always preferable for a household.
- The right to detailed information. In a dispute over an overage, the French Consumer Code entitles you to obtain a breakdown of your consumption. That's also the route for a complaint to customer service and then, if that fails, to the electronic communications ombudsman (médiateur des communications électroniques), who can be contacted free of charge.
The two false economies to avoid
Dropping too low "just to see"
Going straight from 150 GB to 5 GB because the median says 4 GB means condemning yourself to a stressful month and, often, a costly step back up. Respect the 1.5 coefficient. And remember that switching carriers is free and commitment-free on almost all current offers: you can correct course in three months.
Confusing allowance with network quality
A 200 GB plan on a network with poor reception where you live is worth less than a 20 GB plan on a network that works. Before making any trade-off, check Arcep's coverage maps (monreseaumobile.arcep.fr), which compare the four carriers address by address, rather than the carriers' own marketing maps.
Three special cases that change the maths
A teenager's plan. Consumption here is almost always dominated by video, and highly volatile. Rather than a large allowance, a mid-sized one with reduced speeds beyond the cap works better: usage self-regulates without surprise bills.
The driver and the commuter. Navigation, podcasts, music: reckon on about 0.05 GB per hour for mapping and 0.1 GB per hour for standard-quality audio. That's far less than people imagine. The real win here is to download offline maps and playlists over Wi-Fi before setting off — and a simple car phone mount saves you from handling the device while driving, which is illegal anyway.
The traveller outside Europe. Here, no amount of domestic plan sizing will save you: roaming rates outside the EU remain prohibitive. The effective approach is still a local or regional eSIM, bought before departure, with your French plan reserved for essential calls and texts.
Summary: the method in six lines
- Look up your last three months of consumption in your carrier account.
- Reset your phone's counter and watch the per-app breakdown over one cycle.
- Fix the four classic leaks: video autoplay, tethering, cloud backups, Wi-Fi/data switching.
- Calculate your target allowance = three-month maximum × 1.5.
- Check the real coverage of your chosen carrier at your address, along with the European roaming cap.
- Set a data cap on your phone, then switch plans — commitment-free.
The result isn't spectacular in one go: €6 to €10 a month, most of the time. But that's €70 to €120 a year, for half an hour of work and without degrading a single aspect of your usage. In a market where prices are climbing again, it's the one optimisation that costs you nothing.
Key takeaway: a well-sized plan isn't the one that shields you from everything, it's the one whose allowance you use 50 to 70% of each month. Below 20%, you're funding an advertising slogan.
