If I get a 100Mbps Router or Modem, will it increase my 30Mbps home internet?

If I get a 100Mbps Router or Modem, will it increase my 30Mbps home internet? - 1
Added (1). Our family has TWC Home Internet that runs 30Mbps Download Speeds and 5Mbps Upload Speed. The problem is that the internet has been acting up. I did a Ookla Speedtest on my phone and tablet, the phone has a stronger signal(33.93Mbps) than my tablet(22.84Mbps). I'm thinking of get a NetGear Router and/or Modem to increase the speeds. Will it help increase my speeds or are there too many devices on the internet?

We have: One XB360, 2 Laptops, 3 Phones, and iPad and Samsung Tablet

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