Pros: Clearly you can have more meaningful conversations when speaking over the phone than when trading abbreviated text messages. And holding a conversation via cell phone only requires the use of one hand (or none, if you use a headset or hands-free setup).
Cons: The science is still out on whether cell phones raise your risk of cancer. A recent review published in the international journal Pathophysiology shows that a majority of industry-funded research found very little evidence of a link between cell phones and brain tumors—while all of the independently funded studies saw a “significant increased brain tumor risk.” Brain tumors aren’t the only health hazard associated with cell phones. Recent research on brain activity and communication has found that drivers are just as prone to cell-phone-related car accidents while using hands-free devices as they are while holding the phone.