Record-breaking profits and spiraling revenues per user have defined the last few years for the two telecom titans we're going to highligh below as safe, high-dividend stocks to buy in a volatile September.

Add years of assured and growing dividends and large amounts of cash to be generated, and you have two of the safest telecom stocks your money can buy. Here they are: 

AT&T (T - Get Report)

At a market value of $250.45 billion, AT&T has doubled annual revenues, maintained operating margins at above 16% and stayed profitable.

New competition from T-Mobile US (TMUS - Get Report) and old rivals like Sprint (S - Get Report) armed with a plethora of offers and discounts haven't dented its shield of value and cash-muscle.

Satellite TV and Mexico are two other areas driving AT&T results.

Analysts suggest AT&T should bring in 8%-plus earnings-per-share (EPS) growth in the next half a decade -- faster than the nearly 5% growth previously; revenues are also on the rise -- up by 3.39% (five-year average rate).

And 31 years of growing dividends is no mean feat; the current yield of 4.7% is among the best in the telecom business.

Even though there is talk of maturity and growth slowdown, AT&T is ready for the future (see: DirecTV acquisition).

At a price/cash flow valuation of 6.5-times, AT&T is a solid growth-and-income pick given the opportunity to reap rich cash rewards in the form of dividends from this telecom giant.

Verizon (VZ - Get Report)

The Verizon story is a little different. This company has perfected the art of becoming smaller, but staying highly profitable. And while on that road it's also paid out large chunks of debt.

The AOL and Yahoo! (YHOO) acquisitions have given it a more diversified spread. The plan is clear: Grab unloved media brands and become a platform for re-imagination.

Traditionally, Alphabet's Google (GOOGL - Get Report) defines search and Facebook (FB - Get Report)  means social, but there isn't really a place that offers solid media brands to leverage branding ads.

Plus, Verizon is slowly making inroads into the smart living space and IoT segments. Hand-in-hand with its expansion strategies, it's also lifted its quarterly payout incrementally by 2.2%.

At a 57.7% payout ratio, Verizon's dividends are pretty safe. At its current stock price, Verizon yields 4.3%, twice as much as the 2% average yield of dividend-driver stocks on the S&P 500 index.

The $210-plus billion telecom company is on a roll. Buy its shares at a present valuation of less than 7 times EV/EBITDA.

Alphabet and Facebook are holdings in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. See how Cramer rates the stock here. Want to be alerted before Cramer buys or sells GOOGL or FB? Learn more now.

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This article is commentary by an independent contributor. At the time of publication, the author held no positions in the stocks mentioned.