A further argument for the 515: I have an iPad (without sim card). About my old Nokia C2-01 I could give the pad on the way through Bluetooth tethering, access to the Internet. Well sometimes you need some games the network when you travel - even if it is rarely the case. This works well with the Nokia 515 with no problems! An uncommon advantage. I mention this only because it is not so obvious. In other providers such as Sony or Samsung I have so far not manage. But beware: only with the single or mono Sim version of the Nokia 515 works this!
Also worth mentioning is the long battery life.
What should also fold (I habs yet net tried) is the syncing with iSync using a Mac OS computer. At least with my old Nokia it worked. ICal calendar has been, except for a few careless (to which it did not arrive to me so) transferred to my Nokia. Shall I try the days again.
So to all who are looking for an uncomplicated phone bars, which should be compatible with the Macintosh peripheral devices, the Nokia 515 (mono Sim) is your future mobile phone!