# Winning subscribers in a zero-sum market
In many countries, mobile penetration is above 100 percent. In Italy, Germany, Brazil, and the Gulf states, there are more active SIM cards than people, because millions carry two: one for work, one for personal, or one for cheaper data.
Think about what that means. When the total pool of humans is already covered, there is no "new" customer to win. Every gross add (a newly activated line) you gain is a subscriber you took from a competitor. This is a zero-sum market: your growth is someone else's loss.
That single fact reshapes everything about telecom marketing. You stop hunting for the unconnected and start fighting over the connected. This lesson shows you how the sharpest operators do it.
In a growing market, a rising tide lifts everyone. Marketing focuses on awareness and reachreachThe number of unique people exposed to your message in a given period. Unlike impressions, reach counts each person once, no matter how often they see it.View full definition →: get the brand in front of people who do not have a phone yet.
In a saturated market, that playbook fails. The relevant metric shifts to net adds (gross adds minus churn, the customers who leave). You can add a million lines and still shrink if you lost 1.1 million.
So the two levers become:
1. Acquisition: stealing switchers from rivals.
2. Retention: stopping your own base from leaving.
The math is brutal. Industry estimates suggest acquiring a new mobile subscriber can cost several times more than retaining an existing one, once you count device subsidies, commissions, and marketing. That is why retention gets so much attention. But this lesson is about the offensive side: winning share when share is all that is left.
The regulatory tool that makes switching possible is Mobile Number Portability (MNP): the right to keep your phone number when you change providers. Regulators pushed MNP worldwide precisely to make competition easier and prices lower.
Before MNP, changing carriers meant a new number, telling everyone, reprinting business cards. That friction locked people in. MNP removed the friction, which is exactly why marketers now obsess over the port-in (a customer bringing their number to you) and the port-out (a customer taking their number away).
Every port-in is a gross add stolen from a competitor. Every port-out is churn. National regulators often publish porting statistics; the European regulator BEREC is one useful source for how portability and switching are tracked across markets.
🎬 [VIDEO: "How Mobile Number Portability Works" — youtube.com — a short explainer on the technical and regulatory process of moving your number between carriers]
Not all switchers are equal. Blasting the same offer at everyone wastes money. Smart operators segment.
Prepaid customers pay before they use (top up a balance, no contract, no credit check). Postpaid customers get a monthly bill.
Prepaid switchers are the most fluid. They have no contract holding them, they are often price sensitive, and they can churn in a weekend. In markets like India, Nigeria, and much of Latin America, prepaid dominates, so the entire acquisition war runs on prepaid dynamics.
The flip side: prepaid customers are cheap to win and cheap to lose. Winning one with a fat incentive only to watch them leave next month destroys value. So the goal is not just the port-in. It is the port-in that stays.
Segment by expected worth, not just willingness to switch. A common frame:
The trap is treating a deal chaser like a high-value prospect. You pay premium acquisition costs for a customer who is gone before you recoup a cent.
People switch at predictable moments: when a contract ends, when they buy a new phone, when they move, when a bill spikes, when they hit a coverage dead zone at home. Marketing that reaches a rival's customer at their trigger moment converts far better than a random blast. This is why coverage-mapmapUsing software to automate repetitive marketing tasks and campaigns, enabling personalisation at scale across channels like email, web, and social.View full definition → ads and "check if you get better signal here" tools work.
Once you know who to target, you need an offer. Common levers:
Bill credits or cashback for porting in. A one-time credit applied over several months. The multi-month structure matters: it rewards staying, not just arriving.
Device subsidy or trade-in. "Bring your number, trade your old phone, get the new one cheaper." Ties the emotional pull of a new device to the switch.
Pay off their old contract. Some operators cover a rival's early termination fee (the penalty for leaving a contract early). This removes the single biggest reason people delay switching. It is expensive, so reserve it for high-value targets.
Better core value. More data, faster speeds, or added perks (streaming bundles, roaming). Sometimes the strongest incentive is simply a plan that is obviously superior, not a gimmick.
The discipline: model the payback period. If your incentive costs the equivalent of six months of margin, and this segment's average tenure is four months, you lose money on every win. Tie incentive size to expected lifetime valuelifetime valueLifetime Value: the total revenue (or profit) a customer generates throughout their entire relationship with your business.View full definition →, not to what the competitor is offering this week.
Knowledge check
1. Why is a mobile market with penetration above 100 percent described as 'zero-sum'?
2. An operator adds 1 million new lines in a quarter but loses 1.1 million to churn. What does this illustrate about measuring success in a saturated market?
3. Why does retention typically receive heavy investment relative to acquisition in saturated telecom markets?
4. Select ALL correct answers about how marketing strategy shifts when a mobile market moves from growing to saturated.
Select all the correct answers.
5. Select ALL correct answers about Mobile Number Portability (MNP) and its role in competition.
Select all the correct answers.
You can design a perfect offer and still lose, because the sale happens through channels, and channels have their own economics and incentives.
Dealers are usually paid per gross add. Think about the incentive that creates: a dealer earns the same commission whether the customer stays two years or two months. So dealers optimize for volume, not quality. They will happily churn a customer from your rival to you, then back again, collecting a commission each time. This is sometimes called SIM churning or gross add inflation.
Marketers counter this with clawbacks: if a ported-in customer leaves within, say, 90 days, the dealer forfeits or repays the commission. This aligns the channel with real, sticky share.
The core channel metric is cost per gross add (CPGA): total acquisition spend (commissions, subsidies, marketing) divided by gross adds. But raw CPGA lies if you ignore quality. A cheap channel that delivers deal chasers can have a worse true cost than an expensive channel that delivers loyal customers.
A better lens: CPGA divided by expected tenure, or acquisition costacquisition costCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → measured against lifetime valuelifetime valueLifetime Value: the total revenue (or profit) a customer generates throughout their entire relationship with your business.View full definition → by channel and segment. The channels that "move share" are the ones that deliver adds who stay long enough to pay back their cost and then some.
Here is a simplified way to compare two channels on quality-adjusted cost:
Channel A: CPGA = 100, avg tenure = 6 months -> cost per retained-month ≈ 16.7
Channel B: CPGA = 140, avg tenure = 18 months -> cost per retained-month ≈ 7.8Channel A looks cheaper per add but is far more expensive per month of a customer actually kept. Cheapest is not best.
The winning motion in a saturated market looks like this:
1. Accept that growth means taking share, so build the war around port-ins and churn.
2. Segment switchers by value and by trigger moment, not by everyone who might move.
3. Size incentives to expected lifetime valuelifetime valueLifetime Value: the total revenue (or profit) a customer generates throughout their entire relationship with your business.View full definition →, structured to reward staying.
4. Manage channels on quality-adjusted cost, with clawbacks to kill fake adds.
Do this well and you grow net share profitably. Do it badly and you buy expensive customers who leave, funding your competitors' next promo with the very people you just paid to win.