WhatsApp for business prospecting: capture the numbers from Google Maps, then contact them the right way

What is WhatsApp for business?

WhatsApp for business is Meta's set of tools that lets companies talk to customers on WhatsApp. It covers the free WhatsApp Business app for small teams, the WhatsApp Business Platform (API) for automation at scale, and ads that click to WhatsApp. For prospecting, the useful fact is that local businesses already publish their number on Google Maps.

According to WhatsApp's own comparison of WhatsApp and WhatsApp for Business, WhatsApp for Business is a portfolio of solutions: a free app, a more sophisticated API platform and an ad format that clicks to WhatsApp. For a freelancer, an agency or a small company selling to local businesses, the question is rarely how to build a WhatsApp bot. It is how to find the businesses worth talking to, get their contact details, and start a conversation that is welcome. That is the workflow this guide covers, from the number on the map to the first message.

If you only want the capture part, watch the tutorial video and come back for the rules and the follow-up.

WhatsApp Business app, Platform or click-to-chat ads: which one do local companies use?

Most small local businesses use the WhatsApp Business app, because it is free to download and works like the normal app with extra tools. Larger companies move to the Platform when they need many agents, automation or a CRM connection. The table summarises the three products as WhatsApp describes them.

Knowing which one a business uses tells you who you are talking to. A plumber or a salon is almost certainly on the free app, which means the owner reads the chat personally. A hotel group or a chain is probably on the Platform, and a bot or a team answers first. Plan a different opening message for each. For the owner, keep it short and human. For a team, address a role and be specific.

Can you message a business on WhatsApp without asking first?

No, not as a cold outreach channel. WhatsApp's own rules require opt-in, and you accept those rules when you use its business products.

The WhatsApp Business Messaging Policy states that you may only contact people on WhatsApp if they have given you their mobile number or username, and you have received opt-in permission confirming they want to receive subsequent messages or calls from you. It also makes you solely responsible for collecting opt-in in a way that complies with the laws that apply to you, and it requires you to respect any request to stop.

Law sits on top of that, and it varies by country. In the UK, the ICO's business-to-business marketing guidance explains that businesses organised as companies are corporate subscribers, while sole traders and some partnerships are treated like individuals, and that UK GDPR still applies whenever you handle the personal data of a business contact. The ICO also notes that this guidance is under review after the Data (Use and Access) Act. Our guides on whether it is legal to scrape Google Maps and on GDPR for B2B sales teams go deeper on the European side.

Practical reading: a number captured from Google Maps is a lead, not permission. Use it to call, email or visit, and let the business choose WhatsApp. This is not legal advice, so check the rules in the country where you sell.

Where do you find a local business's WhatsApp number?

You find it in up to three places: the Google Maps listing, the business website and its social profiles. The listing gives the main phone, which for many small operators is a mobile line, but nothing on the listing says it is registered on WhatsApp.

Developers can read the same phone field through Google's Places API (New), which requires an API key or OAuth token. A browser extension skips that setup and reads what any visitor already sees, which is why it suits sales teams and freelancers who just need a list. To see how the phone field is captured step by step, read our guide to extracting phone numbers from Google Maps. Social links are covered in capturing social profiles.

How do you capture business numbers from Google Maps with Vonsel?

You search Google Maps, press Start and let the extension collect the results as you explore the map. Follow these steps for a clean list:

1. Pick a niche and an area. For example "hair salons in Austin" or "roofers near me". Mobile-heavy trades and personal services (plumbers, salons, tutors, cleaners) are good first tests.
2. Run the search and press Start. Vonsel gathers business results as you explore the map, going beyond the pins you can see at a glance. You can pause, continue and save the search.
3. Add neighbourhoods or nearby towns. One search only goes so far, so run several narrower searches and keep them in one list. Our guide to how to find local businesses in any city shows how to cover a whole city.
4. Let website enrichment run. Google Maps does not provide business emails. Vonsel visits the available business websites to find published emails, additional phone numbers and links to up to 118 supported social networks and other platforms. What it finds depends on what each website publishes.
5. Organise in the CRM. Keep businesses on a map, group them by stage, edit details and use the Kanban board, calendar, notes, tags and custom fields. Tag the ones with a mobile number or a WhatsApp link.
6. Make a first contact that earns the opt-in. Call, email or visit, then offer WhatsApp for the follow-up.

Free extraction covers 200 businesses a month, so you can test a niche before paying anything. AI features and export depend on your plan, and you can compare them on the pricing page.

What should you do with the numbers after you capture them?

Use them in a short sequence that starts on a channel the business expects and ends on WhatsApp only if they agree. A simple version looks like this:

1. Day 1, call. Open with something specific to the business. Our cold call scripts by vertical give you openers for each one.
2. Same day, email. Send a two-line note with the reason you called and a direct question. If the website enrichment found an email, use it.
3. On reply, offer WhatsApp. Ask "Would it be easier to continue on WhatsApp?". A yes is your opt-in, and you can keep the thread on their favourite channel.
4. Record everything in the CRM. Note the consent, the date and the next step, so you never message someone who said no.

WhatsApp's own page says that businesses use WhatsApp for sales, support and service conversations, and that 80% of messages are read within five minutes and the average open rate is 98%. Those are figures WhatsApp publishes about its own channel, so treat them as the vendor's claim. They still explain why owners answer chats faster than cold emails once the relationship exists.

Before you send anything to a person rather than a company inbox, think about whether data protection rules apply. Sole traders are the usual grey area, because the owner and the business are the same person.

What are the common mistakes with WhatsApp business marketing?

The most common mistake is treating every captured number as a WhatsApp contact and sending the same text to all of them. It breaks the opt-in rule, reads as spam and risks a block on a number you may want to keep using. Avoid these too:

• Mass first messages. Personalise or do not send. A sentence that mentions their reviews, their service or their street is enough.
• Ignoring landlines. A fixed line is not a WhatsApp line. Call it, or look for a mobile on their website.
• Skipping the stop request. Honour opt-outs immediately and remove the contact from every list.
• Duplicates. Dedupe before you contact, so the same owner does not hear from you twice from two listings.
• No record of consent. If it is not in the CRM, it did not happen.