Thanks for that info! Will check it out.
Keep in mind that you, being on AT&T, can swap out your SIM card when traveling using your dumb phone. I did this all across Europe and Russia. There are many services stateside that sell the pre-paid SIM cards and give you a new number. When you dial out, you dial some number in Estonia, and then Estonia calls you back and you get a new dial tone to place your call. It's a bit awkward at first but really works pretty well. Others from back in US or in Europe can dial in to your number without problems or weirdness with Estonia. You recharge minutes via a credit card. Costs vary depending on countries. Some countries you get free incoming, some you do not. Make sure your phone is at least tri-band (I had an old nokia flip 6103) and now have a vintage Motorola Razr quad-band.
Don't forget to copy all your contacts that may be on your SIM card to the phone before changing SIMs.