Bob went to the shop. When he got there, bob bought an icecream.
E.g., "iPad, iPod, iTunes. Follow the company style for capitalization in text: iPad, iPod, iTunes. In headlines, capitalize because the words are nouns: IPad, IPod, ITunes."
Winkler, Matthew (2011-10-14). The Bloomberg Way: A Guide for Reporters and Editors (p. 304). Wiley. Kindle Edition.
And: "When a name begins with a lowercase letter, capitalize the first letter in all references: EBay, not eBay; EasyJet, not easyJet."
Winkler, Matthew (2011-10-14). The Bloomberg Way: A Guide for Reporters and Editors (p. 271). Wiley. Kindle Edition.
"In general, where companies have resorted to unusual typography for undoubtedly innovative and exciting reasons of branding and marketing, we will follow our style,not theirs."
Of course, in your newspaper, you are free to make up your own rules. If you strongly believe in the tenets of "You shouldn't" then English is probably not the right language for you.
https://www.google.com/search?q=site:theguardian.com+iphone
See the sections "capitals" and "company names" here http://www.theguardian.com/guardian-observer-style-guide-c
In particular:
"In general, we use the names that companies use themselves: c2c, Capgemini, easyJet, eBay, ebookers, iSoft Group, etc."
"Adidas: use initial cap on this and any other firms that use the lower case for their initial letter. Keep caps that break up a one-word name (cf EastEnders) as in EasyJet. In general, where companies have resorted to unusual typography for undoubtedly innovative and exciting reasons of branding and marketing, we will follow our style, not theirs."
When I was editing a consumer magazine, the - highly subjective - rule I followed was "initial cap unless it looks stupid, and don't capitalise articles". So EasyJet, C2C, but iPhone (fails "looks stupid" test) and the Times (definite article).
There's apparently immense social pressure to capitalize titles, but it isn't enforced by HN.