Thanks very much everyone for the replies. I really appreciate it.
I guess I should explain a bit more about the situation. The girls we sponsor so they can go to school...the family is very poor like many in Neuvo Progeso. The oldest girl just turned 12 and she is extremely smart. We communicate when we go there, as I have an app on my phone where when you speak or type into it, it translates into Spanish. It has a built in dictionary so I do not need internet access.
I gave them my laptop and we gave the oldest girl Karelly a Nexus 7 tablet, but the tablet does not have the capability for a sim card, only wifi.
We gave them money to get a Telcel stick, and for $60 they got one, and it worked on the laptop I gave them...however...the husband indicated to me that the monthly cost for data was only $5. Didn't seem right to me at all...but with the language barrier...that was how we had to leave it.
We gave them $100 and were hoping they could maintain internet access with the stick, but I guess they ran out of $$ or something. The oldest one Karelly, takes the tablet and goes outside of a local dentists' house, he gave her the password for his internet, so she is able to do that once in a while and chat with us on facebook. That is about the only thing she uses it for, so there is not very much data usage at all.
I am always looking for ways to try and have them maintain constant internet as we always want to stay in touch with them. They are just like our own family now!
So my options are...give them enough money so they can keep the monthly fee going for the Telcel Data. They have to go to Rio Bravo to arrange it.
Get them the the Telmex landline as gtla9111 suggested...trouble is they often have to move at a moment's notice, as they do not own a house, and often live in what is no better than a shack.
My cell plan here has 400 mb data, as I do not use it too much. I appreciate that 200 mb is not a lot at all, but better than nothing when it is for life on a $179 tablet through T-Mobile, and Karelly is very responsible and would only go on facebook and chat with us for a ten minutes or so every now and then. That's all she does when using wifi while sitting outside the Dentist's house now.
I was just looking for the best way, so that they have continuous access, without costing $50 a month or more, as we do not have unlimited resources to fund that amount.
We go to Texas every March for a month, as we have a trailer in Pharr, Tx. and we spend as much time with the family as we can. We gave them money so they all have Mexican passports now, and we are trying to get them Us Visas, we gave them money so they can apply...not an easy process though, and may not work.
So thanks again everyone for your suggestions...by writing this is appears to me, that it looks like I may only have one real option and that is to fund the Telcel stick with enough data so it takes them month to month. We have a great time chatting with Karelly on facebook chat...she writes in spanish, we use an online translator, translate our english reply into spanish. It certainly is not perfect, but works well enough where we are happy to maintain contact.
The kids are great and we feel they are just like our own daughters.
If anyone has any more info or valuable suggestions...I am always open.