R. v. Wong, 2012 ONCA 767 upholds a 30 day sentence for a bail breach of having a cellphone. The purpose of the ban is to limit the accused in participating in drug trafficking.
III. Sentence of 30 Days' Imprisonment –
Breach of Recognizance
 The sentencing judge, as we have said, also imposed a sentence of 30 days' imprisonment, concurrent, for the appellant's breach of his recognizance. The term at issue, a prohibition against possession by the appellant of a cellphone, was designed to impede his involvement in the drug trade. We see no error in principle in the sentence imposed for the breach of this term nor is the sentence demonstrably unfit..