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Usually, when everyone else is working, and you are on your phone, it makes you look like you aren’t putting in 100%. IMO I usually like it if someone has to use their phone at work, for them to do it at a break or to be as discrete as possible about it. Though sometimes your position requires you to do so and it cannot be helped. Just be aware that this is the age of technology and none of us are dumb–we are aware if you are messaging on your computer, on Facebook at work, etc– and it does not look good when your full attention is required and others are more than capable of remaining focused and dedicated while on the clock.