How do I transfer my whatsapp messages from old phone to new phone? I've been using Samsung Tab and the USB cable is not usable. I've been seeing answers like backing up my messages to my SD card from my old phone and insert it to my new phone, but the problem is my new phone ( Samsung Alpha ) doesn't have the SD card slot. So is there any other way to transfer my Whatsapp messages without the use of USB cable and SD card?
You should upload the Whatsapp folder (to google drive, etc.) on your old device and download it again on your new device. Then copy the directory to /sdcard.

Hope I helped you!