Yes, but it's not ideal. Use a PDF reader like Adobe Acrobat Reader (Mobile) and enable "reflow" mode. Alternatively, convert the PDF to EPUB format for better phone reading.
Focus on Everyday CommunicationThe vocabulary is highly practical. You won't waste time on obscure words. Instead, you focus on ordering coffee, shopping for groceries, talking about hobbies, and navigating a workplace. schritte international a1 pdf
Hueber has a free app called (iOS/Android). If you buy the physical book (even used cheap online), you can scan the pages with the app to unlock free audio and interactive exercises. You don’t need the PDF at all! Yes, but it's not ideal