Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Telephone Compatibility

This unit is not compatible with the Sprint PPC 6700 as posted above! Make sure you call Pioneer with your telephone model number for compatibility. I tried the PPC 6700 and my wife's phone (another sprint phone, not sure on the model number). Both have issue and Pioneer's customer service agent was horrible and would not help solve this issue, only to blame me for not calling Pioneer first!This unit is the first device that was not compatible with my phone that I ran into!