Ok, I know a lot of people love their Android and iPhone smart phones and could not live without it, but to use those phones you need a data package. Or if you're traveling internationally, you have to pay more money for an international roaming package. I don't need a smart phone since all the emails/apps/contacts will be on both my laptop and iPad. I just need a phone to make and receive some calls (mostly in-country) and to send/receive text messages.
Since I can easily swap in an in-country SIM card, it just makes sense to get a local number wherever I am. If I need to forward work calls to my cell phone, I can do so with Skype or any other VoIP service. Because the Nokia N79 is GSM quad band (GSM 850 / 900 / 1800 / 1900) I can use it in pretty much any country in the world.
I bought mine used on eBay for about $65. Since Nokia is a quite popular phone brand worldwide, it will be easier to get it serviced at local electronic kiosks that fix cell phones, should there be a problem, or to get a new battery or find a charger. As a worst case scenario, I can also purchase a used Nokia phone in a country and swap in the SIM card if this phone breaks.
The advantage in my opinion to using a phone for just calling/texting, is that is it small and lightweight. It has got two weeks of standby time, weighs in at under 100 grams, and very portable. Plus since it doesn't have a huge screen like iPhone or Samsungs, I'm not worried about cracking the screen if it drops. Plus, since it's an older model and not so flashy, I'm not as worried about it being stolen.