My PM Interview® - Preparation for Success

My PM Interview® - Preparation for Success

How would you improve Google Fi?

How to identify the right levers for growing Google Fi’s subscriber base and reducing churn across plan tiers.

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My PM Interview
Sep 03, 2026
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How would you improve Google Fi?

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1. Clarifying Questions

Before diving in, I would want to align on a few things to make sure I am solving the right problem:

  • Are we focused on US subscriber growth, international expansion, or both? Google Fi’s value proposition differs significantly across these contexts.

  • Is the primary goal to grow the subscriber base, reduce churn, or improve ARPU? These could pull in different directions.

  • Are we scoping to consumer plans only, or should we include Fi for Business as well?

  • Are there specific user segments, for example, Pixel owners, frequent travelers, families, or small businesses, that leadership wants to prioritize?

  • What timeframe are we optimizing for: short-term (next two quarters) or longer-term brand building?

For this answer, I will assume we are focused on US consumer growth with an eye on reducing churn and improving differentiation, across all plan tiers, over a 12 to 18 month horizon.


2. Product Description

Google Fi is a mobile virtual network operator (MVNO) that uses a combination of T-Mobile and US Cellular networks, plus Wi-Fi calling, to deliver flexible mobile service across the US and internationally. Unlike traditional carriers, Fi automatically switches between networks to give users the best available signal.

Fi offers three main plans: Simply Unlimited (single-line budget option), Unlimited Plus (enhanced features with high-speed data), and Flexible (pay-per-GB), which was historically its signature differentiator. International data is included in all plans at no extra charge in over 200 countries, which is a strong draw for frequent travelers.

Google Fi is deeply integrated with the Android ecosystem, particularly Pixel devices, though it supports iPhones and other Android phones with some feature limitations. It also offers group plans, eSIM support, and a Fi VPN built into the service.

Despite these strengths, Fi remains a niche product. It has an estimated 2 to 3 million subscribers, a fraction of what major carriers like Verizon, AT&T, and T-Mobile command. Awareness, trust, and network perception are ongoing challenges.


3. Define Goal

The core goal is to grow Google Fi’s active subscriber base while reducing monthly churn, in a way that strengthens Google’s broader hardware and services ecosystem.

More specifically, I would frame the goal as: Increase net subscriber additions by 30% year-over-year while reducing monthly churn below 2%, through better differentiation, improved onboarding, and tighter ecosystem integration.

Secondary goals include:

  • Increasing awareness and consideration among Pixel device buyers

  • Growing the share of subscribers on higher-value Unlimited Plus plans

  • Making Fi the default recommendation for Google’s own hardware customers

Success should be measured not just on subscriber count but on the quality and retention of those subscribers, since high-churn growth destroys unit economics.


4. User Segmentation

Google Fi’s potential users can be grouped into a few distinct segments, each with different needs and motivations:

Segment 1: Pixel Power Users

These are people who already own or are considering a Pixel phone. They trust Google’s ecosystem, care about software experience, and are open to a carrier that integrates tightly with their device. They want seamless setup, good coverage, and the convenience of managing everything through one brand. This is Fi’s most natural audience and likely the highest-conversion segment.

Segment 2: Frequent International Travelers

Business travelers, digital nomads, and people with family abroad who make multiple international trips per year. They are frustrated by roaming fees and SIM swapping. Fi’s included international data is genuinely compelling for them, but they may not know about it or trust the coverage claims.

Segment 3: Budget-Conscious Switchers

People on plans from Verizon or AT&T who feel they are overpaying. They want reliable service at a lower price and are willing to switch if the experience feels trustworthy and the savings are clear. This segment is large but requires overcoming perception gaps around network quality.

Segment 4: Small Business Owners and Remote Teams

Small teams, freelancers, and micro-businesses who want a simple multi-line plan with business-grade features like call routing, VPN, and admin controls. Fi for Business exists but is underdeveloped and under-marketed.

Segment 5: Young Adults and Students

College students and early-career professionals who are cost-sensitive, tech-savvy, and open to trying new services. They respond to referral programs, social proof, and flexible plans with no long-term commitments.

For this exercise, I will prioritize Segments 1 (Pixel users) and 2 (frequent travelers) as the core ICP, with Segment 3 as a volume growth lever.

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5. Pain Points

Based on what we know about Fi’s current challenges and common user feedback, the key pain points are:

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