Engadget reports that Apple has just received approval from a certification board for four new iPhones with capacities ranging from 4 GB to 32 GB.

4GB to 32GB — that’s one hell of a range, but we’re hearing from a trusted source that new iPhones in 4GB, 8GB, 16GB, and 32GB capacities just garnered approval by the PCS Type Review Certification Board, the standards body responsible for certificating handsets for use with some carriers (AT&T, for instance).

Engadget believes that Apple is unlikely to deploy high-end hardware and software features on iPhone models with capacities as low as 4 GB, suggesting that Apple may begin offering models differentiated by more than just storage capacity. Perhaps this confirms there will, in fact, be a sub-$100 iPhone. Several rumors in the past regarding “iPhone nano” with scaled down hardware and/or software, as well as speculation regarding software-driven differentiation, have long pointed to the possibility of such variation in Apple’s iPhone offerings.

- source: engadget.com