Facebook-owned messaging platform, WhatsApp , is one of the most popular instant messengers in the world. WhatsApp enjoys the largest user base in India. The user-friendly, free WhatsApp, which started off as a basic messenger, now has some pretty impressive features. From hiding your number to accessing a secret GIF library, here are some tips and tricks that will make you a WhatsApp pro. Incognito Hiding your number on WhatsApp This trick helps users hide their phone numbers while using WhatsApp and requires two SIM cards. After registering with WhatsApp using the first SIM, users need to replace the old SIM with the new one. WhatsApp will prompt them to change the number, but they can choose to use the old number. Users can keep their current number safe even while using WhatsApp. Settings Whom do you message the most? Did you know that WhatsApp on iOS lets users know whom they have been chatting with the most? Under "Set...