If you're specifically creating content around using WhatsApp on older phones like the Sony Ericsson J20i, consider focusing on:
To understand the incompatibility, one must examine the J20i's architecture: whatsapp sony ericsson j20i
He scrolled to 'Connectivity'. He turned on Wi-Fi. Miraculously, the old 802.11 b/g chip picked up his home network. He typed in the password using the T9 keypad, his thumb muscle memory instantly returning. 8-4-3-5-9. whatsapp sony ericsson j20i
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