AT&T gives you $100 just for activating a new line
The conditions of the deal/s may have changed since the initial publishing of this post.

AT&T is trying everything to combat T-Mobile, but everywhere it turns it sees the smiling visage of John Legere staring back. Recently, the nation's second largest carrier offered a package it valued at a $450 value for those leaving T-Mobile for AT&T. Now, AT&T is offering $100 in the form of a bill credit to those who activate a new line. The offer is valid for new and existing customers.
Don't expect to open a line, grab the $100 credit, and desert the line. Nope, AT&T is one step ahead of you there. To qualify for the credit, the newly activated line must remain active and in good standing for 45 days. And AT&T will give you the credit some time within the first three billing cycles.
If you were planning to add a line to your existing AT&T account, or were planning on switching to the mobile operator, might as well do it before March 31st, because that is when this offer expires.
source: AT&T via AndroidCentral
If you were planning to add a line to your existing AT&T account, or were planning on switching to the mobile operator, might as well do it before March 31st, because that is when this offer expires.

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