T-Mobile has announced that it will offer the iPhone 3G in Germany for as little as one euro with a qualifying monthly contract, following the lead of O2 in the United Kingdom, which announced that it will offer the phone for free in a similar subsidy promotion. Customers purchasing an 8GB iPhone 3G with a 69 euro, 24-month contract from T-Mobile will pay only 1 euro for the phone, with the 16GB model starting at 19.95 euros with an 89 euro monthly…