I currently have both a Nexus 4 and a Nexus 7. I am on T-Mobile for the Nexus 4 and although my Nexus 7 is a cellular version, I typically just use wifi. Later this year my family and I will be camping at Mille Lacs Kathio State Park in central Minnesota. Typically, we have some T-Mobile service, but it is 2G, at best. So, I might be inclined to get a pre-paid SIM card for that trip. If I understand things correctly, I could put the SIM card in the Nexus 4 and tether to the Nexus 7 or vice-versa. Anyway, which would be preferable or would it even matter? I am inclined to things that simply getting service on the Nexus 7 would be preferable and then other family members could tether from the Nexus 7 and if I left the area, I would still have my Nexus 4 with me. At least, I am ASSUMING that there are pre-paid SIM service available for tablets. Anyway, what people here do it the way I suggested or is there some reason to get pre-paid service on the NExus 4 and tether to that? Oh, and on a side note, I do have an extra phone or two to insert my existing T-Mobile SIM card in, if that matters.