You can get a second phone number for texting in a few ways:

1. By using a texting application like Qnum on your iPhone or Android device. Qnum gives you a second phone number that works for everyday texting, whether you want to keep conversations organized, maintain privacy, or separate different parts of your life. You can text from the Qnum application without needing another device.
2. Adding a second SIM or eSIM through your carrier.
3. Using a second prepaid phone. 

If you want a second number that’s easy to manage and doesn’t require a new phone, Qnum is the most cost effective and straightforward solution.