The most common and most likely answer to this crossword clue is the 7 letter word MOBILES
I've seen this crossword clue in The Daily Telegraph
M
O
B
I
L
E
S
More clues leading to the result MOBILES
Buddy explains!

The straight part
We know that "Phones" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case phones = mobiles.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does MOBILES mean?
MOBILES noun- A kinetic sculpture or decorative arrangement made of items hanging so that they can move independently from each other.
- The internet accessed via mobile devices.
- Something that can move.
- A portable telephone that connects with the telephone network over radio wave transmission.