How do I transfer Contacts from an HTC Android to an iPhone?

You should be able to:

1) Go to your contacts on the HTC, choose import/export > export to storage and save them to 'Phone'

2) Put your HTC phone into disc-drive mode and connect it to your computer

3) Copy the .vcf file from your HTC (which will appear on your Mac as an external hard drive)

4) Set-up your mail account on the iPhone

5) Send that mail account an email with the .vcf file as an attachment

6) Open the mail, click on the attachment and tap 'Add all contacts'

Et viola, as they say in the section of the orchestra just behind the violins

Or, if you have a Googlemail or Gmail account on the HTC, and you contacts are stored there you could just set up the same account on the iPhone using the Exchange mail option, and it should pull through all your contacts.

Excellent. Ta v much

As suggested, I copied all my contacts to Google, & then it's easy to get the contacts on iPhone / Windows phone.

Done steps 1-3, then opened the .vcf file on my Mac, but only 50% of the phone's contacts are in the .vcf 

Have I done something wrong? 

Is it 50% contact names missing or 50% contact information tho all the names. Whilst the phone stores all info, the sim card only stores one number for each contact. Sorry if this is a red herring since I know my plaice. 

50% of contact names  

Could it be that some of your contacts are stored on the phone's memory, and some on the SIM? I'm not very familiar with the HTC phones, so wouldn't know how to check this, or copy them all to one place, but I am sure someone on here can advise.

Via Mac / Safari, I've just logged into my Gmail account, peeped in its Contacts and all of my HTC's contacts are listed, which is kinda spooky - "how did they get there?"

So, I've now synced the Mac's Contacts with Gmail's and, in turn, I'm assuming the iPhone will sync with the Mac's Contacts... correct?

Ta for advice, folks

Just in case anyone else needs to transfer an Android phone's contacts to an iPhone, here's the solution:

As discussed above, load the Android phone's Contacts into your Mac's Contacts / Address Book via Gmail. 

Next, open Contacts / Address Book on your Mac, click on any single contact to select it, go to Edit > Select All (Command-A) to select all contacts.

Go to File > Export > Export vCard, and then save this file on your Mac desktop.

Send an email to yourself with this file attached.

Open the email on your iPhone and tap the attachment to import the contacts 

Oh, and in future, only edit / add to Contacts on your iPhone, not your Mac. If iPhone's Contacts is amended, iCloud will auto update your Mac's - but not vice versa, for some reason 

Export contacts from HTC to vCard and then import the file to Gmail. And then launch iTunes and connect iPhone to Sync contacts.

Currently i am thinking that through iphone application development i should create an application that can do this instantly without getting into too much trouble.