It will gain a fixed-line arm, but that is no recompense for what it will give up: its lock on the massive mobile market, encompassing two-thirds of Chinese customers and an even higher share of new subscribers.

ECONOMIST: Telecoms in China

The general wisdom when deciding between an ARM and a fixed jumbo is the same as with any mortgage, Mr. Gumbinger said.

WSJ: Fixed-Rate Jumbo Mortgages Make a Comeback

Given that 15-and 30-year fixed mortgage rates are at a historic low, why even consider an ARM?

FORBES: Why You Should Get An ARM