Most phone counts are added in drug prosecutions to bring forth another charge, thereby adding points to your sentencing scale. The Count is generally using a cell phone while committing a crime (facilitate a drug transaction). If this applies to you, be sure to communicate with your federal defense attorney and receive more specific advise.
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Multiple count charging is a strong and effective prosecution strategy in both Federal and state prosecutions. It weakens the defense's position and many times adds significant increases to potential prison sentences. This is accomplished by the prosecution via many levels of strategy (to note few) relevant conduct, mandatory minimum sentencing, consecutive vs concurrent sentencing. At a trial it increases the likelihood of the jury finding the defendant guilty of something.
These concepts underscore yet another example that only experienced criminal defense lawyers are equipped to deal with the multifarious aspects of defense tactics and strategies.
Of course, every answer or response is based on the information provided in the question asked and requires a much more complete context than is available in this public forum. This answer/response should NOT be relied upon to make any legal decisions. Seek the advice of an experienced Federal and/or state criminal defense attorney in your jurisdiction BEFORE you say or do anything.