Can I fix a 4G router to a telegraph pole?

[Thebeeches]

I have a 2 x Telegraph Poles on my property which supplies my neighbours phone line. I done have a phone line in my property as use a 4G router and voip. I want to attach the router to one of the poles as they give a much better signal being nice and high. What are the implications of attaching my router to the pole? 
They serve me no purpose at present. and if they’re not useful. I shall just cut them down... 

[Keith_Beddoe]

@Thebeeches 

The poles are owned by Openreach, and they would not permit unauthorised attachments, and if you cut cables down, you will be faced with a charge to repair them.