Can I use my Chatr phone in the US?

Chatr offers US roaming. Yes. You need to be travelling of course to a place that has network coverage and remember that special roaming fees will apply.  Currently, Chatr's rates when inside the US are:

50¢/min - for incoming and outgoing local calls

50¢/min - additional charge for outgoing long distance calls

free - incoming text messages

15¢/message - outgoing text messages 

50¢/message + $6/MB - outgoing MMS messages

$6/MB - data usage

Not cheap but that's the cost if you want to keep your phone number. More economical of course is to have an unlocked phone and buy a local SIM when you arrive the US or buy a special roaming SIM and a plan with someone like Roam Mobility

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