Yes, it is possible to start and run a business using only a phone. With the advancements in technology and the availability of various mobile apps and tools, entrepreneurs can manage many aspects of their business operations from their smartphones. Here are some examples and references to support this:

1. Communication: A phone allows you to make calls, send texts, and use various messaging apps to communicate with clients, suppliers, and employees. Apps like WhatsApp, Slack, or Microsoft Teams enable real-time communication, file sharing, and collaboration.

2. Email and Calendar Management: Mobile email apps such as Gmail, Outlook, or Apple Mail allow you to send, receive, and manage business emails on the go. You can also sync your phone's calendar with your business appointments and set reminders.

3. Social Media Management: Many businesses rely heavily on social media for marketing and customer engagement. Apps like Facebook Pages Manager, Instagram for Business, or Hootsuite enable you to create and schedule posts, track analytics, and respond to messages and comments.

4. Project Management: Mobile project management apps such as Trello, Asana, or Basecamp help you organize tasks, assign responsibilities, and track progress. These apps offer collaboration features that allow you to work with remote teams efficiently.

5. Accounting and Finance: There are mobile accounting apps like QuickBooks, FreshBooks, or Xero that help you manage your business finances. You can create and send invoices, track expenses, and generate financial reports directly from your phone.

6. Online Selling: If you plan to sell products or services online, you can set up an e-commerce store using platforms like Shopify, WooCommerce, or Etsy. These platforms offer mobile apps that enable you to manage your store, process orders, and track inventory.

7. Customer Relationship Management (CRM): CRM apps like Salesforce, HubSpot, or Zoho CRM allow you to manage customer interactions, track leads, and analyze sales data. You can access customer information, update records, and nurture relationships from your phone.

8. Virtual Meetings and Conferencing: With video conferencing apps like Zoom, Google Meet, or Microsoft Teams, you can conduct virtual meetings, presentations, and client consultations from your phone. These apps offer features like screen sharing and recording.

While a laptop can provide a larger screen and more processing power, a phone can still serve as a powerful tool to manage many aspects of your business. However, it's important to consider your specific business needs and evaluate whether a laptop would be beneficial for tasks that require more complex software or extensive typing.