Here are nine most unusual phones the world has ever seen

The ZTE Axon M
The phone was made by ZTE and it had launched in October 2017. Why stop at one screen when you can have two? That's what went through the designer's mind while building this phone. The Axon M comes with two displays and it's foldable. Each one is a 5.2-inch FullHD LCD display.
 
Display - 5.2 inches each
Processor - Qualcomm Snapdragon 821
Camera - Rear- 20MP
Front - NA
Battery - 3180 mAh

YotaPhone 2
The smartphone, built by the Russian company Yota, was launched in February 2014. It also came with two screens. However, in this case, the second screen is on the back of the smartphone and doubles up as an e-ink screen for a better reading experience.
 
Display - 5.0 inches
Processor - Qualcomm Snapdragon 801
Camera - Rear - 8 MP
Front - 2.1 MP
Battery - 2500 mAh

LG DoublePlay
This phone has a dual screen as well but it has a different take on how to implement it. The DoublePlay comes with a unique display and keypad setup. It has a split keyboard. The DoublePlay was released in October 2011
 
Display - 3.5 inches
Second - 2.0 inches
Processor - Qualcomm Snapdragon
Camera - Rear - 5 MP
Front - NA
Battery - 1500 mAh

BlackBerry Passport
As the name suggests, this was the only smartphone to feature a square screen and a footprint that is identical to that of a passport. It was launched in October 2014. Blackberry had been struggling in the smartphone market and expected Passport's unique form factor to pick up, but the sharp design did not sit well with buyers.

Display - 4.5 inches
Processor - Qualcomm Snapdragon 801
Camera - Rear - 13 MP
Front - 2 MP
Battery - 3450 mAh

Nokia 7280
The phone was known as lipstick phone, and rightly so. This unique form factor took an entirely different approach to mobile phones. The phone had no keyboard but came with a dial to control the user interface. The camera was hidden with a slider mechanism. The 1-inch screen was a limitation but the device was portable in the true sense. It was launched in 2004.
 
Display - 1-inch
Processor - NA
Camera - Rear - VGA
Front - no camera
Battery - 700 mAh

Siemens Xelibri 6
The Xelibri was a flip style mobile phone. But don't mistake it as any flip phone. Siemens was trying to build something special, just for women. From the very first look, you'll be confused about where does the phone start and grooming kit end or vice versa.
 
Display - NA
Processor - NA
Camera - Rear - NO
Front - NO
Battery - Removable Li-Ion battery with talk time up to 4 hours.

Samsung Serene
The phone was made by Samsung and popular audio hardware company Bang & Olufsen. Serene had a unique take on flip phones with a small display and keypad in a round format.

Display - NA
Processor - NA
Camera - Rear - VGA
Front- no camera
Battery - 800 mAh

Toshiba G450
The phone is tiny and can easily be mistaken as a USB memory card. It was first released in January 2008 when mobile manufacturers had more liberty with the design. The glass slab iPhones had just taken off but that did not stop Toshiba from experimenting with radical designs. The phone had a tiny circular screen with two circular keypads.
 
Display - NA
Processor - NA
Camera - No camera
Battery - 600 mAh

F88 Wrist Phone
This phone that looks more like alien technology, was actually made by a Chinese company called CEC Corp. The company was famous for trying their hand (no pun intended) at wristwatch mobiles.
It has a 180- degree rotating camera and keyboard on the strap and also a prominent antenna on top.
 
Display - NA
Processor - NA
Camera - Front - 3 MP
Rear - no
Battery - NA