In brief, if you're in a hurry
In recent years, mobile phone plans promising “unlimited data” have become some of the most heavily advertised offerings. But the word “unlimited” can be misleading. Before choosing a plan, it helps to understand the key points:
- Actual meaning of “unlimited”: No mobile plan is truly infinite. Almost all offerings include thresholds for high-speed data. Once these limits are reached, the connection is slowed down, a practice known as throttling.
- Throttling and performance: After speeds are reduced, streaming, video calls, web browsing, and hotspot use can become difficult or nearly unusable.
- Types of limits: Some plans set explicit monthly data caps; others compare an individual’s usage to the average of similar users. Consequences vary, from temporary slowdowns to full SIM suspension.
- Differences between plans: Two “unlimited” plans can behave very differently depending on thresholds, reduced speeds, and throttling duration.
- Actual user consumption: According to the AGCOM Observatory (first half of 2025), SIM cards generate in Italy an average of less than 1 GB of data per day, about 29 GB per month.
What unlimited data plans really mean
In recent years, our digital lives have intensified. We stream videos, work remotely, use maps, and browse social networks almost constantly, often from our smartphones. Unsurprisingly, mobile phone plans promising “unlimited data” have become one of the most popular marketing claims.
By 2025, across traditional SIMs and travel eSIMs, nearly all major providers offer so-called “unlimited” plans. But what does this label actually mean—and, more importantly, how reliable is it?
The short answer: in most cases, “unlimited” data is not truly unlimited. The longer answer, and the one worth understanding before choosing a plan, is more nuanced.
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Why “unlimited” doesn’t mean limitless
Technically and contractually, no mobile plan is infinite. Even plans advertised as unlimited include clauses defining how much traffic can be used at maximum speed. The most common mechanism is the Fair Usage Policy (FUP). Providers define a threshold of “high-speed” data considered normal for personal use. Once that threshold is exceeded, the connection isn’t cut off but is slowed down.
This is where throttling comes into play.
What throttling is (and why you notice it immediately)
Throttling is the deliberate reduction of connection speed by a provider after a certain amount of data has been used. At the start of the billing period, daily or monthly, data flows at full speed. Once the FUP threshold is reached, speed drops sharply. Technically, access remains “unlimited,” but the user experience changes dramatically.
At reduced speeds—often around 1 Mbps or lower—videos buffer constantly, video calls become unstable, maps may fail to load, and hotspots are nearly unusable. This is why the amount of high-speed data matters more than the word “unlimited.”
How usage thresholds make a difference
Many mobile providers apply daily limits of 3–5 GB before throttling occurs. For a ten-day trip, an “unlimited” plan might effectively provide just 30–50 GB at full speed. Some providers are less transparent, using vague terms like “average use” or “abnormal traffic,” leaving users uncertain. Often, people discover these limits only when their connection slows unexpectedly.
What happens to apps when throttling kicks in
The difference between high-speed and throttled data is tangible. With full-speed access, YouTube and Netflix run smoothly; after throttling, buffering begins. TikTok and Instagram go from fluid scrolling to frequent loading pauses. Google Maps may take seconds to display a map. Calls on Teams, Zoom, or Meet become unstable, and even basic web browsing slows, with delayed emails and partially loaded pages.
Hotspot and tethering: included or restricted?
Many unlimited data plans limit hotspot use, throttle it first, or prohibit continuous connections across multiple devices. For students, remote workers, business travelers, and digital nomads, this is a significant difference: a plan may be “unlimited” on a phone but inadequate for working on a laptop.
Why companies still use “unlimited”
From a marketing standpoint, “unlimited” is a powerful word. Legally, it’s defensible, as Internet access is almost never cut off, and limits are disclosed in contracts (though often unclearly). Transparency remains a major issue. Some providers clearly state thresholds and speeds; others rely on vague wording, leading to user confusion.
The promise of “unlimited data plans” becomes even murkier in practice. Plans advertised under the same label can have widely varying rules, significantly affecting user experience. Some set explicit monthly caps, often a few hundred gigabytes. Others compare usage to statistical averages: exceeding five times the typical consumption may be deemed excessive, leading to temporary slowdowns or, in repeated cases, SIM suspension. Throttling may be permanent until renewal, temporary for hours or days, or, in extreme cases, result in service suspension without a clearly stated numerical limit.
Two “unlimited” plans may therefore behave radically differently: one may tolerate high usage spread over time, while another throttles heavily if usage is concentrated in a few days. Without reading contract details, users often cannot predict which scenario they will face. Many only discover limits too late—through a warning message, sudden speed drop, or disrupted connection. The promise of “unlimited” always comes with precise (and often hidden) definitions of what counts as acceptable use.
Do you really need an unlimited data plan?
It depends on how you use the Internet. Unlimited data plans make sense for frequent video streamers, remote workers, regular hotspot users, or travelers who don’t want to monitor consumption. In many other cases, a plan with 50 or 100 GB of clearly defined data is more cost-effective and predictable. High-capacity bundles often perform better than unlimited data plans with low thresholds.
According to the AGCOM Observatory, in the first half of 2025, roughly 61 million human-operated SIMs generated data traffic, averaging about 0.94 GB per day—a 12.2% increase over the previous year. Despite growing availability of data, users typically consume less than one-tenth of what’s offered. The most popular plans provide 200–250 GB per month, while actual consumption averages around 29 GB. This reflects that most daily activities require modest data, with the largest consumption coming from video content such as films, sports events, and video calls. On average, a two-hour Full HD film consumes about 3 GB, a four-hour sports event about 7 GB, and an hour-long HD video call around 540 MB.
Based on these figures, plan capacity can be estimated: 70 GB allows five films, four sports events, and six hours of video calls; 100 GB, ten films, six sports events, and ten hours of calls; 150 GB, up to 50 films, 18 sports events, and 200 hours of video calls. The overall picture shows that typical user needs can be met even with modest data plans, without resorting to “unlimited” packages. Improvements in mobile networks, including 5G, make data more abundant and accessible, confirming that most people use far less than what is offered.
What to check before choosing an “unlimited” plan
Before purchasing an eSIM or mobile plan advertised as unlimited, check key aspects: fair usage policy, throttling thresholds and speeds, hotspot and tethering rules, roaming conditions, and coverage in the destination country.
Finally, consider whether your habits truly require “infinite” data or merely a clearly defined quantity.
“Unlimited” is a simple word, but the reality of mobile plans is far more complex. Today, nearly everything is governed by thresholds, network priorities, and fair usage policies. This is not inherently bad—it helps maintain network stability—but it becomes a problem when rules aren’t clearly explained. Understanding what you are buying—how much data at full speed, for how long, and under which conditions—is the best way to avoid surprises. More than asking whether a plan is truly unlimited, the key question today is: how transparent is it?