LocalPhone free calls to USA for 4th July Weekend

Today I received a mail from LocalPhone
about Localphone offering free calls to USA this weekend. Let me share the content of mail with you.

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To help commemorate the 4th July Weekend we’re giving completely free calls to landlines and mobiles in the United States!

From 04:00am GMT on Friday 2nd July through to 10:00am GMT on Monday 5th July you can talk to the US for as long as you want, to as many people as you want, and we won’t charge you a cent!

New and existing customers can make free calls from your landline or mobile using Direct Dial or Calling Card, or from your PC, iPhone, or other VoIP-enabled device with LocalPhone
VoIP.

You can also buy a number in any of our 46 Incoming Number countries and forward calls to your landline or mobile in the US for free throughout the weekend!
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Update : Localphone is running a promotional offer. When you sigh up with $1 credit, you will get $2.5 credit. That's additional $1.5 credit as bonus.
$1.5 credit is worth 100 minutes to India. This makes cheapest voip provider to India with effective rate of just 0.6 cents per minute. This offer can be used to call other countries as well. What are you waiting for. Just try Localphone.
(No expiry of credit, good voice quality, and sign up with as low as $1).