niechar hi and welcome to your new, contract free mobile network! 🙂
Is there anything to be aware of with giffgaff?
Your credit balance and goodybag are two different things. Credit is used to pay for those calls and texts which are not included in goodybags (eg international or premium numbers, using your phone abroad), for when you have run out of minutes, texts or data in your goodybag, or for when you don't have a goodybag and want to run PAYG.
Dial (for free) *100# for your credit (PAYG) balance and *100*7# for details of your current goodybag
Please see here Goodybags and credit for more on giffgaff's tariffs and guidance on which one is right for you.
giffgaff runs on the O2 network so you should get the same level of network service as O2 customers. You can check on the network coverage where you are using the service status checker.
Need to make calls to USA and Germany sometimes. How much is it and what to I have to do?
You need to topup your credit balance here https://giffgaff.com/top-up to call international numbers as they're not included in goodybags. The international calling tariffs can be seen here https://giffgaff.com/international
Your giffgaff SIM is enabled for international usage. Further you can use goodybags in EU countries at no extra cost for up to 63 days at a time. See here for more guide to using your SIM abroad.