Most current Android devices and iPhones have hotspot capability AND allow multiple simultaneous connections. You could always unlock your iPhone and get a digicel simcard then use that as your hotspot, but unless you are out of contract AT+T will not unlock your iPhones.

Or, you could switch your service in the USA to T-Mobile, then take those devices to JA and you'll get free unlimited text messaging within JA and back to the USA, unlimited basic internet at no charge, and calls within JA and back to the USA are .20/min. No need for a hotspot, just use your devices as you always do... not only in JA, but in more than 100 countries worldwide.

T-Mobile will even pay your termination fees at AT+T, you'll end up paying less every month for your cell phone and mobile internet service, and all the current plans include the above mentioned international usage for no additional charge.