If you simply want to return phone to factory status, just go to
Settings -> About, and choose Reset Your Phone.
And if your phone is stuck when using some applications like whatsapp the phone may get hang this time use the soft reset expained below
SOFT RESET for Lumia 930,(Lumia 900,Lumia 920
- Press and hold the volume keys, power button and camera together for 3-5 seconds
- The phone should soft-reset . some phones have 3 vibrations
Lumia 630,Lumia 625
- Press and hold the volume keys and power button together for 3-5 seconds
- The phone should soft-reset
In some phones press and hold the POWER BUTTON FOR 10 Seconds
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