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Yes you can get WiFi on most android tablets.
No it does not have wifi calling because that aplication is developed for tmobile phones.
No. There is no WiFi signal capable of going that far.
It is basicly a wifi hotspot from an android device. It uses the mobile data on your phone and sends it through wifi so you can use your mobile data on your laptop/other wifi abled devices
If your phone is wifi capable, yes.
no
ATT recently (Sept, 2014) announced that it will introduce WiFi calling for iPhone in 2015.
Use the android phone.If it works its better.
You are referring to 3G. Yes it is capable of doing everything that WiFi is capable of. You need to get a 3G plan from your service carrier.
yes... For example, if you have a wifi network, you can enable wifi on the android phone and then upload photos from the phone. Also, I have not really tried it, but OFF topic, with wifi you can make a phone call on your android phone even if per say you are no longer with the cell phone provider
yes
If you have Wifi, Youtube.