A mobile electronic device 10 with an enhanced tolerance accumulator 106 is disclosed. The device 10 can include: a housing 150 including a front housing 34 and a rear housing 86; and a user interface 62, the rear housing 86 including a tolerance accumulator 106. Advantageously, this construction provides a robust and durable low profile mobile electronic device, desired by users and the tolerance accumulator 106 provides a durable structure capable of expanding or contracting, as necessary.