Should we check our childrens phones?

Although not directly related to my project, it's a side step slightly, but I read this story today via Facebook and wanted to write a little bit about it here. The question was posed on Q & A website Quora and was written by a lady called Lara Estep who has posed the question whether it is acceptable to look through your children's phones. The story can be found at the following link:

https://www.quora.com/Is-it-okay-for-parents-to-look-through-their-childs-phone/answer/Lara-Estep

The question is an important one in my eyes but one a lot of parents would hesitate to answer. Children are getting younger having phones nowadays, or even devices at all, and this opens up many ways of contact through the wonderful world wide web. Where the children can have phones and the ability to call and text, we now have apps and games where there are facilities to be able to contact other users.
I have recently read this article on The Mirror online, where the Mirror has found two Uk police forces who have been investigating separate cases of messages on the app Musical.ly sent by paedophiles to children. These people can send private messages through these apps and are using them to groom children and these are things that we and our children need to be aware of. In relation to Lara's story, it was through text and Facebook that her child was being sent messages by a new friends father, asking her to meet him.
It's difficult to show the dangers in these circumstances to children, especially younger children. They are too young and naive to truly understand the dangers they could be faced with in these situations. I'm sure there are many articles like the one posted in the Mirror, and I know there have been many many stories in the news regarding children being groomed through social media. And this is something that has emphasised through the technology that is available today.
Lara's story and question, is relatable and a concern for so many parents, purely for the risks I have discussed, if not for others. Personally, my children are still very young and so I have explained to my eldest that she is to report to me immediately should she ever receive a message or anything through any of her apps, etc. I have all their log in details but if I have any concerns, I talk to them and they willingly show me, without me having to look on my own behind their backs. As they get older, I'm sure they will get more secretive and I will have to trust them. If I absolutely had to as I felt their safety was compromised then I'm sure I wouldn't hesitate, much like Lara. But as kids are so engrossed in the age of technology, this is something that a lot of parents now have to worry about as the technology not only opens the gates for things like this to happen, but also opens the door for kids to be a lot more secretive about their lives inside this technology.