In the end, To use the phone in the classroom will be positive or negative effects are caused by the end user. If it's beneficial, positive effects. If misused, can lead to negative effects.
Ultimately, Using the phone in the classroom will result in positive or negative, it all stems from the use of. If the benefit is a positive effect. If used in the wrong way, it was negative.
In the end. To use the phone in the classroom will be positive or negative, it is caused by the user at all. If the benefit is its positive. If used in a wrong result negative.