Hi,
I purchased three avast licences a while ago and now I have a spare one which I would like to install on my phone. However I can't find where to enter the licence key in the app. Does anyone know how to do that?
Thanks in advance! 
Currently the avast license isn't cross platform, so you couldn't apply it to an android phone. Avast have made comments about making it possible to have a multi platform license, but as an avast user I don't have any details on this or likely time frame if it does proceed.
You could always submit a support ticket to sales to see if they could swap one for one. Unfortunately there isn't a specific form to handle this question/option, so you could try a request for refund form -
https://support.avast.com/support/tickets/new?form=2 - when that opens click the Order Modification button. That is possibly the closest option and it allows you to leave your query in text format.
