An operator announces tariff increases of about fifteen per cent. The next quarter, some customers leave or drop a second SIM, revenue rises by roughly thirteen per cent — and operating profit by more than a quarter. Nothing about the network changed. That asymmetry, between a modest move in the monthly bill and a large move in profit, is the first thing to understand about telecom, and it cuts just as sharply the other way when operators compete on price.
A bus company pays for its buses, drivers and diesel whether each trip carries ten people or sixty. Raise the fare by two rupees and, if few passengers stop travelling, almost all of the extra money is profit. Start a fare war and the buses still cost the same to run, so the losses are just as swift.
A telecom network is that bus. Towers, fibre, spectrum and staff are paid for regardless of how much customers pay. Revenue is subscribers times the average bill, so the price of the bill — set by tariffs and by the plans people choose — decides the profit far more than the number of customers does.
Subscribers × ARPU
- ARPU
- average revenue per user per month
- Average subscribers
- the customer base averaged over the period
Example: 30 crore subscribers paying ₹200 a month is ₹72,000 crore a year. ARPU is watched quarter by quarter; subscriber numbers are published monthly by the regulator.
| Metric | What it tells you | What to look for |
|---|---|---|
| ARPU | Pricing and plan mix | Rising ARPU from tariff increases, customers moving to costlier plans, and more postpaid users |
| Subscriber net additions | Market share | Adding paying, active subscribers — not only SIMs. Watch the quality of additions, such as 4G and 5G users |
| Churn | Customers leaving each month | Low churn means sticky customers; rising churn after a tariff increase shows how price-sensitive the base is |
| Data usage per subscriber | Engagement, and future network load | Higher usage supports higher plans but also forces more network investment |
| EBITDA margin | Operating leverage | Rises sharply with ARPU because costs are fixed |
| Capex and net debt | What the network and spectrum cost | Capex as a share of revenue, and net debt to EBITDA |
The balance sheet is spectrum and towers
Operators buy spectrum — the right to use radio frequencies — in government auctions, often paying part upfront and the rest in instalments over many years, which sits on the balance sheet as a deferred liability. Rolling out new networks, such as 5G services launched in India in October 2022, needs heavy capex on towers, fibre and equipment. So the question for any operator is whether its operating cash flow covers capex and spectrum payments, or whether the gap is being funded with debt.
Tower companies
A tower company rents space on its towers to operators. Each tower’s cost is largely fixed, so the key number is the tenancy ratio — the average number of operators per tower. Every extra tenant adds high-margin rental income; losing one, as happens when an operator exits the market or merges, hurts margins quickly. The risk to watch is concentration: tower companies depend on a handful of customers, and one struggling operator’s unpaid dues can affect the whole business.
A telecom operator’s subscriber count is flat, but ARPU rose 10% after tariff increases. Its EBITDA most likely:
Telecom ki kamai = subscribers × ARPU (har grahak ka mahine ka bill). Network, tower, spectrum ka kharcha lagbhag fixed hai — grahak zyada de ya kam, kharcha wahi. Isliye 15% tariff badha toh revenue ~13% badha, par EBITDA 26%! Price war mein ulta — munafa utni hi tezi se girta. Spectrum auction mein kista pe khareeda jaata hai, 5G ke liye bhaari capex — isliye balance sheet asli kahani. Licence fee AGR ka 8% — 2019 ke Supreme Court faisle ne kai companies pe bada bakaaya daal diya tha.
- Mobile revenue is subscribers × ARPU; ARPU is the number to watch first.
- Costs are mostly fixed, so tariff increases lift profit much faster than revenue — and price wars cut it just as fast.
- Spectrum payments and network capex make the balance sheet central: compare cash flow with capex and spectrum dues.
- The licence fee is 8% of AGR; the 2019 AGR ruling shows how regulation can reset the economics.
- For tower companies, watch the tenancy ratio and dependence on a few operators.
Mark it done to track your progress through the curriculum.
Common questions
Short, direct answers to what people ask about this topic.
- ARPU meaning in telecom
- ARPU is average revenue per user — a telecom operator’s mobile revenue divided by its average number of subscribers, usually expressed per month. It is the single most watched telecom number because revenue is essentially subscribers times ARPU, and because most of an operator’s costs are fixed, a rise in ARPU from tariff increases or customers moving to costlier plans flows largely to profit.
- why do telecom tariff hikes increase profits so much
- Because a telecom network’s costs — towers, fibre, spectrum, staff — are almost entirely fixed and do not rise when customers pay more. When tariffs go up, revenue rises while costs barely move, apart from levies charged as a percentage of revenue, so most of the extra revenue becomes operating profit. The same operating leverage works in reverse during a price war.
- what is AGR in telecom
- AGR, or adjusted gross revenue, is the revenue figure on which Indian telecom operators pay the government a licence fee and spectrum charges. What it should include was disputed for years; in October 2019 the Supreme Court upheld the government’s broader definition, creating large past dues for several operators. The licence fee is 8% of AGR, which is why it behaves as a variable cost that rises with revenue.
- what is tenancy ratio for tower companies
- The tenancy ratio is the average number of operators renting space on each telecom tower. A tower’s costs are largely fixed, so each extra tenant adds rental income at very high margins; a tower company with a rising tenancy ratio is growing profitably, while one losing tenants — for example when an operator exits or consolidates — sees margins fall quickly.