I found it in Fred Vogelstein's "Dogfight: How Apple and Google Went to War and Started a Revolution" [0]. Decent read, not amazing IMO, but with fun tidbits about the iPhone / Android launches

[0] https://libgen.is/book/index.php?md5=60B714243482AE3D7B9A83B...

Any book about the development of the iphone or articles in the business press from a few months after product introduction (if any are still online…try Fortune).