I'm thinking about getting an iPhone for a friend whose vision is decaying because of the possibility of making it display large text.
However, the budget is very tight, buying a new iPhone is out of the question. She needs only basic services: telephony, the occasional text message, and Skype.
Would a used iPhone 3GS make sense for this? According to GSMArena, the 3GS is still supported by iOS up to version 6, which (so I understand) makes Skype compatibility no problem. Is there anything else that might speak against getting her this 4-years-old model?