Carol, FWIW I use EuroBuzz. They're having a special for March - 2 phones and SIM and S&H for $59. I have been very pleased with the service, the phones themselves, and the voice sound quality when calling the USA.
To send a text costs $0.79; to receive one is free. You can call and receive calls from home, too. $0.79/minute to receive calls from the USA; your friends and family will pay whatever the rate is for them to call the UK. Calls to anywhere in Europe AND the USA are $0.79/minute. Simple. $0.79. All you have to do is charge them before leaving home (USA adapter included) and that's it! NOTE: they are dual-band European phones; they will not work WITHIN the USA. They are a post-paid company - you only pay them AFTER you've made a call. It will show up on your credit call bill like any other charge. No needing to top-up your minutes, or worrying about how many minutes you have left on your SIM. The phone number never expires, so you can throw it in a drawer and use it on your next trip - whenever that may be. The SIM is for Europe, too - it's not limited to one country, so you don't need to buy one for each country you'll be visiting.
FYI, this is the same company as Mobal world phones, only restricted to Europe.