Disclaimer: I work for a 1300 provider, and think 1300 numbers are pretty cool, so there's a definite bias in what I'm about to say!
One of the things that is really cool about 1300 numbers is that they come with built in reporting that tells you things like the time, date and duration of each call, the location of the caller (where possible e.g. not blocked numbers of calls from mobiles), and the number of calls you failed to answer.
This sort of information is really useful to help you measure marketing success. For example, did you get a huge increase in calls the day you posted something on the Flying Solo forum.
We have customers who have multiple 1300 (or 1800) numbers, and use a different one for each channel/campaign (e.g. one for the web site, one for the blog, one for a radio ad). This helps them to quickly determine which of their marketing campaigns/channels are translating into the highest number of calls, and help them decide where their marketing spend is most effective.
We also hear anecdotally from our customers that they get an increased number of calls after switching to a 1300 or 1800 number. I don't have any hard facts to back that up, other than suggesting you look at the number of 1300 number providers out there, and figuring that if they didn't work, there wouldn't be so many of us!
There are plenty of providers out there who will host your number month by month (no contract), and also a really wide variety of plans out there so you can likely find one that is right for your business and the number (and types) of calls you expect to receive.
If you've got any specific questions, let us know. There are a couple of other 1300 providers on this forum too, so you'll likely get plenty of help!
Cheers
Gail
PS ... just noticed an excess number of smiley faces ... blame it on too much coffee too early in the morning!