T-Mobile is getting more aggressive with its advertising and is really trying to steal customers away from AT&T and Verizon. Now with Stash Your Data plans, T-Mobile wants customers who use a lot of data to actually be able to actually use that data. AT&T has previously responded with rollover data, but it is not as user friendly as T-Mobile's plan.

T-Mobile did away with contracts a while back, and in the fourth quarter of 2014, the company says it added 2.1 million new customers. The company now has 55 million subscribers.

T-Mobile is likely tied for third or overtook Sprint in subscribers. Sprint reported 55 million subscribers at the end of Q3 2014.

The way T-Mobile does plans is definitely unique. The company does not charge overage fees on minutes, texts or data. If a subscriber has a 3 GB data plan and they only use 2 GB that month, the remaining 1 GB of data is added to their data bank. This data bank is good for up to 12 months.

T-Mobile even lets you bring your own device, as long as it is compatible with their network. If consumers want, they can grab a phone on eBay and take it to a T-Mobile store for activation and save a ton of money.

The Stash Your Data plan from T-Mobile is currently the friendliest in the market. AT&T has rollover data but only lets you roll it over for one month; there is no banking of data like T-Mobile has.

Still, AT&T subscribers (about 75 million as of Jan. 1) and Verizon (about 100 million subscribers as of Jan. 1) need to think about coverage maps. A phone only works when it can get cell service, and Verizon and AT&T are regarded as having the best coverage maps.

Would you switch over to T-Mobile? Why or why not? 

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