€20/month vodaphone gives unlimited calls to other vodaphone numbers for the month. You will be charged for calls to other networks but you should get quite a bit out of it if you keep calls short.
Tesco is probably the most economical, 15 euros gives a large volume of calls and a generous internet allowance for the month, of course some do not like 089.
Others will probably knoe about other networks or deals.
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Shalom/salaam.
10,000 years of Middle Eastern civilisation and the place is not at peace but rather in pieces.