Can I charge my iPhone 4 with a 2.1 mA transformer?

My older AC/DC Apple transformer outputs DC at 1 mA. But it has been stolen by my mother for her iPhone 5. So now I have this off-brand AC/DC transformer  that outputs DC at 2.1mA. Is this safe to use with an Apple cable and an iPhone 4?

Yes it's safe. There's active (maybe passive?) regulation circuits in all the devices that limit the amount of current. The ipad charger might charge slightly faster since the output is 5.1 volts; the iphone charger is an even 5 volts.

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