The situation
Phonetronics Kenya sells phones, tablets and accessories online and delivers across Kenya. Like many Kenyan shops, its customers want to ask a question before they buy, and they want to ask it on WhatsApp.
The shop runs a Google Ads Performance Max campaign built to start those WhatsApp conversations. Its budget is modest, and Google spends all of it every day. That last detail matters: when a campaign is limited by budget, every wasted click is a customer you never get to talk to.
Over the 30 days to 13 October 2026, the campaign's cost per lead fell to about a third of its earlier average, a 69% drop, without any increase in budget. You can see the numbers in the full case study. These are the lessons behind them.
1. Count the action your customers really take
Google can only optimise for what you measure. If your customers buy over WhatsApp but your campaign only tracks website visits or clicks, Google will happily find you cheap clicks from people who never message.
For Phonetronics, a conversion is a WhatsApp chat started from an ad. That is a real person asking about a real phone, which makes it a far better signal than a page view.
What to do: decide which action means "this person might buy" for your business, whether that is a WhatsApp chat, a call or a form, and set it up as the conversion in Google Ads before you spend another shilling.
2. Tell Google what you sell, in buyers' words
Performance Max decides where your ads appear, but you can guide it with search themes: short phrases that describe what people search for when they want what you sell.
We added 17 search themes built around how Kenyans actually shop for phones: price and buying searches for iPhone, Samsung, Vivo and Google Pixel in Kenya and Nairobi, plus tablets and accessories. People who search for a price are usually close to buying.
What to do: write down the exact phrases your customers use, including the town and the word "price", and use them as search themes or keywords. Generic phrases such as "phones" attract browsers; specific ones attract buyers.
3. Show Google who your best customers are
Audience signals tell Performance Max who to look for first. They guide Google; they do not stop anyone else from seeing your ads.
The strongest signals come from your own data. We gave Google the shop's website visitor lists, including past buyers, product viewers and people who left items in their cart, and added Google's phone-shopper segments on top.
What to do: if your website has the Google tag installed, build audience lists of past buyers and recent visitors and add them as signals. Your own customers are the best description of who to find next.
4. Let real results choose your headlines
Google shows how each headline performs. After 30 days of results, we replaced the five weakest headlines with new ones focused on what buyers care about: buying online in Kenya, ordering on WhatsApp, delivery across the country and the brands they want.
Just as important, we kept the best performer, a headline about contactless delivery that was bringing in more leads than any other. The descriptions and images were already rated well, so we left them alone.
What to do: review your headlines once a month. Replace the clear losers, keep the winners and avoid rewriting everything at once, or you lose what was working.
5. Use your own creative, not someone else's
The campaign had been showing product review videos made by other creators. Those videos promote the phone, not the shop, and a viewer can easily buy elsewhere.
We replaced them with four short videos made from the shop's own product photos, carrying its logo and business name. Because they were made with AI tools, they are labelled as AI-created, as some regions require.
What to do: every ad, image and video should make it obvious who is selling. Even simple videos made from your product photos beat a polished video that sends viewers to a competitor.
6. Change bidding on purpose, then be patient
We switched the campaign's bidding from a fixed return target to Maximize conversion value, so Google aims for the most valuable conversions within the budget.
Any bidding change sends a campaign back into a learning period. Results can wobble for several days while Google adjusts, and edited ads also go through a short review.
What to do: change bidding only for a clear reason, make other edits at the same time rather than one by one, and give the campaign at least a week before you judge it. Checking every morning and changing things again resets the learning.
7. Leads are not sales, so track the sale before you scale
A WhatsApp chat is a lead, not an order. Until Google can see which chats and clicks turn into purchases, it can only optimise for conversations.
Our next recommendation for the shop is to track purchases on its website and give each order a real value. Then Google can learn which searches bring buyers, not just enquirers, and results can be judged by revenue.
What to do: before you raise a budget, make sure purchases are tracked with real values. A bigger budget only pays off once Google knows what a sale looks like.
A small-budget Google Ads checklist
Use this before you spend more, or before you decide Google Ads does not work for you:
- The conversion you track is an action that leads to sales, such as a WhatsApp chat, a call or a purchase
- Your search themes or keywords use the exact words buyers search, including prices and locations
- Your own customer and visitor lists are added as audience signals
- Weak headlines are replaced monthly, and the best performers are kept
- Every image and video shows your brand, not someone else's
- Bidding changes are given at least a week before you judge them
- Purchases are tracked with real values before the budget goes up