Do all tablets have sim slot? And how to connect to internet?

SIM cards are only used by GSM cellular devices. CDMA cellular devices don't use SIM cards.

Tablets come in two types:

1.) WiFi - A Wi-Fi tablet connects to the Internet via a wireless connection to an existing Internet source such as your broadband wireless router and DSL modem. It can also connect to free wireless hotspots such as those found in airports, hotels and restaurants.

2.) Cellular - A cellular tablet includes a service contract to a cellular carrier such as Verizon or At&t. It may or may not have a SIM card depending on the cellular technology used. You can get on the Internet anywhere there is a 3G or 4G signal.

Good Luck...

Not all tablets have sim cards. However you can connect through wifi.

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