Instead of buying multiple SIM cards for your upcoming multi-country trip, why not save yourself a bundle, quite literary, by getting a bundle plan from Lycamobile?

What is great about the Lycamobile bundle plans is that they have no roaming charges for voice and texts, and you can use your UK SIM card so you do not need to buy a separate SIM card for each country you are traveling to. You can buy both voice and text only plans, as well as data plans from Lycamobile and when you run out of text or voice credit you can simply login to Lycamobile UK website to buy additional bundle.
You can order a free Pay As You Go Lycamobile SIM card from their website and check out the calling rates for dialing abroad. The calling rates are actually very good, even for countries like Macedonia...only 12 per minute from a landline and 29p per minute from a mobile. SMS texts are only 19p per text.
The Lycamobile network includes a total of 21 countries: UK, Australia, Austria, Belgium, Denmark, France, Germany, Ireland, Italy, the Netherlands, Norway, Poland, Portugal, Romania, Spain, Sweden, Switzerland, Hong Kong SAR, Tunisia, USA and Macedonia.