greenfog69 if your currently in Poland it's likely to do with the German call identification line which is messing numbers up all over Europe from start of December try switching to 3g only via mobile/cellular network settings and try the manual roam from list shown here it's helped others out
try all that applies to you here please
If sim was activated outside UK you'll get 14days Grace of usage on goody bags
If sim was used for a few weeks in UK prior to going overseas you'll get this
Remember you only get 63 days maximum usage on goody bags roaming within any 4-month period.
Try this handy guide to using giffgaff overseas.
Make sure you have a live goody bag or credit allowance left via here - https://giffgaff.com/dashboard
Double check roaming is enabled via here - https://giffgaff.com/profile/details#rlah
Make sure all toggles relating to roaming are set to ON - https://giffgaff.com/call-services
Try what's called a manual roam as explained here -https://giffgaff.com/help/articles/how-to-perform-a-manual-roam
Check this guide to using giffgaff overseas - http://community.giffgaff.com/t5/Using-giffgaff/Using-your-mobile-abroad/ta-p/3522931
Double check your settings APN settings in this guide -
settings try here please
https://giffgaff.com/help/articles/internet-apn-settings-guide
Or
manual settings could you try this guide via your mobile data settings an select add new apn or edit a prestored one EG 02 then enter these Connection Name: giffgaff
APN: giffgaff.com
Proxy: Not set
Port: Not Set
Username: giffgaff
Password: [leave blank]
Server: Not set
MMSC: http://mmsc.media messaging.co.uk:8 002
MMS proxy: 82.132.254.1
MMS port: 8080
MCC: 234
MNC: 10
Authentication Type:"PAP or CHAP"
APN type: default,supl,mms
APN protocol: IPv4
APN roaming protocol: IPv4
Bearer: Unspecified
MVNO type: IMSI
MVNO value: 23410x also remember to click save once you have entered these setting an restart phone
Check out the fair usage guide - https://giffgaff.com/fair-usage-while-roaming
