is the mc610ll an at&t model, or factory unlocked?
att
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When it is being sent to a carrier like att or verizon the part number identifies who ts being sent to , for example
Apple iPhone 5 16GB White AT&T MD635LL/A
Apple iPhone 5 16GB White Verizon MD655LL/A
Apple iPhone 5 16GB White Sprint MD657LL/A
Apple iPhone 5 16GB White GSM Officially Unlocked MD294LL/A
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I have a break down of all models prior to 5, if u want i can email it.