How to convert a 2G sims operating device to a 4G?
I have 2 GSM 2G Sims card listening devices which is not capable to work on 3g or 4g network.. Since cell phone companies now require a 4g sims card and the listening devices have not advance to work on the 3G or 4G network, I need to convert my device to work on a gsm/wcdma. The problem is that I don't have an older sims card. AT&T and T-Model are stating I have to get their 4G sims. And I can't find a cell phone company still operating on Edge (2g ). Can anyone help?
Here's a link to show the 2 devices: