Your pack says 56 GB. You used 70 GB worth of internet last cycle and still spent three separate mornings on a crawling connection, wondering where a number that large went.
Nothing went missing. A 2 GB/day plan for 28 days is not a 56 GB pool. It is 2 GB, twenty-eight times, and the two are different products with different prices. Below is the arithmetic that turns a ₹349 plan into a ₹532 one, and the point where a bigger daily cap becomes the cheaper option.
Table of contents
- Where the 14 GB goes
- What happens at 64 Kbps
- Boosters against the next tier up
- Paying for headroom you don't use
- Find your own daily average
- FAQ
- Sources
Where the 14 GB goes
Jio's ₹349 pack gives 2 GB a day with 28 days of validity, unlimited calls and 100 SMS a day. Airtel's ₹349 plan has the same daily cap and validity. Multiply and you get the 56 GB that every comparison page prints.
Now suppose you use 2.5 GB on a normal day. That isn't a heavy day, just one with a video call and some autoplay in a feed.
| Per day | Per 28-day cycle | |
|---|---|---|
| Plan gives | 2.0 GB | 56 GB |
| You need | 2.5 GB | 70 GB |
| Unserved | 0.5 GB | 14 GB |
Half a gigabyte sounds small, but it happens 28 times, and a light Sunday never offsets it because midnight deletes whatever you didn't spend. The cap resets and doesn't accumulate. Finish early on Tuesday and the plan owes you nothing extra on Wednesday. Barely touch it on Sunday and nothing carries to Monday.
So 56 GB is the most the plan will ever serve, and only if you use exactly 2 GB every day. Any other pattern gets you less.
What happens at 64 Kbps
All the major Indian operators treat an exhausted daily limit the same way. The connection stays up and speed drops to 64 Kbps until midnight, on Jio, Airtel and Vi alike.
That is worse than it sounds. 64 Kbps carries WhatsApp text and roughly nothing else. Video won't play at any resolution, maps spin without drawing the route, data calls fail to connect and images arrive line by line. For whatever you were doing when the cap hit, the phone is offline with the bars still showing.
That's how a daily shortfall turns into a purchase. You're at a bus stop needing a map, you buy a booster, and what you pay for the plan stops being the price printed on it.
Boosters against the next tier up
Add-on data vouchers cost far more per GB than the base plan, and the rate swings with pack size. Small 5G add-ons around ₹61 for 6 GB work out to ₹10.17 a GB. Larger vouchers land nearer ₹4 to ₹7 a GB. Those figures move every few months, so check your own operator's app instead of trusting a number in a blog post, this one included.
Take the ₹61 for 6 GB voucher against the 14 GB shortfall above. Vouchers sell whole, so you buy three of them, not 2.33:
shortfall = (2.5 - 2.0) x 28 = 14 GB
vouchers needed = ceil(14 / 6) = 3
booster spend = 3 x 61 = ₹183
real cycle cost = 349 + 183 = ₹532
cost per GB used = 532 / 70 = ₹7.60
Compare that with Airtel's 2.5 GB/day tier, which starts at ₹399 for 28 days and covers the same 70 GB with nothing bought on top:
| Cycle cost | GB served | Per GB used | |
|---|---|---|---|
| ₹349 plan + 3 boosters | ₹532 | 70 | ₹7.60 |
| ₹399 plan, 2.5 GB/day | ₹399 | 70 | ₹5.70 |
The cheaper-looking plan costs ₹133 more per cycle. A 28-day plan bills 13.04 times a year rather than 12, so that comes to ₹1,734 a year for starting from the smaller sticker price. The Mobile Data Usage Calculator runs this comparison on your own daily figure and your operator's booster price, and reports the cost per GB you use instead of the cost per GB the pack claims.
If you're buying a booster most cycles, you want a bigger daily cap, not a bigger booster. Add-on data is priced as an emergency, and emergencies bought on a schedule are just an expensive plan.
Paying for headroom you don't use
The same maths runs the other way, and this side is quieter because nothing ever breaks.
Use 1.2 GB a day on that ₹349 plan and you consume 33.6 GB of the 56 GB you paid for. The 22.4 GB you never touch isn't saved, refunded or carried anywhere. Your effective rate is ₹10.39 per GB used, worse than the person who overshot and bought boosters.
| Daily use | GB used per cycle | Cost per GB used |
|---|---|---|
| 1.2 GB | 33.6 | ₹10.39 |
| 2.0 GB | 56.0 | ₹6.23 |
| 2.5 GB (with boosters) | 70.0 | ₹7.60 |
Before you drop a tier, check what else the pack carries. Unlimited 5G eligibility on Jio and Airtel generally attaches to plans at ₹349 and above with at least 2 GB daily. The bundled OTT subscriptions on pricier packs are worth real money if you'd otherwise pay for them. A ₹349 plan judged only on its data is judged unfairly, so price the data on its own, then decide whether the rest is worth the difference.
For the whole household, mobile plus broadband plus DTH plus OTT, the Recharge Cost Calculator annualises all four and handles the 28-day cycle correctly instead of assuming 12 recharges a year.
Find your own daily average
Every number above depends on one input, and it's the one people guess. A guessed daily figure gives a confident wrong answer, so pull the real one.
On Android it's under Settings, Network and internet, SIMs, then app data usage. On iPhone, go to Settings then Mobile Data, where the running total needs a manual reset to be useful. Take a full week and divide by seven. One day is never representative.
The reading goes wrong in four ways:
- A quiet day used as the average understates the shortfall, so the plan looks adequate while boosters keep arriving.
- Counting only deliberate usage misses background app updates and cloud photo backup, which land on the same cap.
- Reading total GB off the pack instead of the daily cap is the original mistake this post is about.
- Hotspot days can throw the average completely, because a laptop tethered through one work day can outrun the phone's whole week.
Roughly, per hour: 4K video around 7 GB, 1080p around 3 GB, 480p about 700 MB, and browsing and social feeds 100 to 300 MB depending on how much video the feed autoplays. Music streaming is negligible next to any of it. So one settings screen can sometimes close the gap for free. Forcing video to SD on a phone-sized display, turning off autoplay and restricting app updates and photo backup to Wi-Fi can halve a daily figure without changing what you do with the phone. Try that before paying for a larger cap.
FAQ
Is a 2 GB/day plan for 28 days the same as 56 GB?
No. It is 2 GB available on each of 28 days, and unused data expires at midnight. 56 GB is the total only if you use exactly 2 GB every day. Any lighter day permanently reduces what the plan serves you.
What happens after the daily data limit is exhausted?
Speed drops to 64 Kbps until midnight and the connection stays active. Text messaging works. Video, maps and data calls effectively don't. Daily-cap plans don't roll over on Jio or Airtel, so unused data is gone at midnight. Only fixed-quota data vouchers hold their balance until used or expired.
Are data booster packs cheaper than upgrading the plan?
Once per cycle, usually. Every cycle, no. At ₹61 for 6 GB you pay ₹10.17 a GB, so three vouchers turn a ₹349 plan into ₹532, while a ₹399 plan with a 2.5 GB cap covers the same usage for ₹133 less per cycle. Add-ons also need an active base plan: a voucher supplements a plan, it doesn't replace one, and it activates when the daily allowance runs out.
Does unlimited 5G solve the daily cap?
On eligible plans the 5G data is separate from the daily 4G allowance, but eligibility is tied to plan price and daily cap, and it applies only inside 5G coverage on a 5G handset. On 4G or outside coverage, the daily cap is all you have.
Sources
- Jio ₹349 prepaid plan: 2 GB/day, 28 days, unlimited calls, 100 SMS/day: TelecomTalk, 12 September 2026.
- Jio unlimited 5G eligibility on plans from ₹349 with at least 2 GB daily: Bajaj Finserv plan listing.
- Airtel prepaid plans with a 2.5 GB daily cap, starting at ₹399 for 28 days: 6 September 2026.
- Post-limit speed reduction to 64 Kbps until the daily reset: Jio support.
- Data vouchers queue behind an active plan and activate when the daily allowance is exhausted: Jio support.
- Booster pricing of ₹61 for 6 GB (₹10.17 per GB) is used illustratively; add-on pack sizes and prices change every few months, so verify the current rate in your operator's app. All per-GB and per-cycle figures here were computed from the plan prices cited above.
