Nice, but if you asked your questions like this:

user_reply = input('''1) Phones \n 2) Cables and Adapters \n 3) Headphones
>>> ''')

it would be better.
The triple quotes ''' lets you have more than one line of text (you can push enter) and then you can have the python-style >>> input prompt.

Also the numbers make it confusing: do I type 'Phones' or do I type '1'?

Make it clear at the beginning - I recommend numbers because that eliminates spelling mistakes.
Try to add an invalid input:

import sys

if user_reply == '1':
  #do thing
elif user_reply == '2'
  #do thing
else:
  print('invalid input. please start again')
  sys.exit('Error message here')

That would at least tell the user what went wrong.