Information
===========
    Data: 2-3/4-5/8-12/15-40/100-Unlim
    Extra Data: Reload/1GB/Day Flat/Cap
    Roaming: EU/Swiss/World/Everythere
    Tethering: Inland/EU/Swiss/World/Everythere
    Extra SIM: Same Number/Other Number
    Connection: Home/Outside/Abroad Home/Abroad Outside
    Calls/SMS:
    Notification
    Homespot: 100-200 GB / 30-45 EUR

UK
==
    Giffgaf (O2)                        10/12/15/25             +/?/-/384Kb 8-24        Full                            +       -                       ~/?/?/?         Flat            -
    Three (Three)                       10/15/20/27/30          +/10/?/-                19GB/12GB/top tarif/-           -       -                       ?/?/?/?         Flat            -
        with 12 month contract           -/11/15/19/21-27       5/5/5/-                 19GB/12GB/12GB/USA,ANZ,SA       +       -                       ?/?/?/?         Flat            ?
    Vodafone                            10/ -/20/30/-           ?                       Full/?
        with 12 month contract          15/ -/17/-/20           ?                       Full/Full/6 day/Most            +       -                       ?               Flat            ?

 - Three
    * 5 GBP for 18 GB extra traffic on 12GB+ tarifs. And 5 GBP further for Unlimited.
    * Priority bag drop with EasyJet
    * Romaing in: http://www.three.co.uk/Support/Roaming_and_international/Roaming_Abroad/Destinations
 - Vodafone
    * Global Global Plus allows free roaming in ANZ, USA/Canada, Turkey. Other countries are 6 GBP per day.
        http://www.vodafone.co.uk/cs/groups/public/documents/webcontent/vfcon092802.pdf
 - O2
    * O2 Travel Inclusive Zone: ANZ, USA/Canda, South America. 5 GBP per day otherwise.

Germany
=======
    Aldi (Eplus):                       10/15                   +/7                     Full/5                          +       -                       ~/~/?           Paid            -
    Simplytel (O2/Eplus):                8/13/23                -/5/-/16Kb              Full                            +       3/5 (1GB)               +/~/?           Flat            1 month
    Congstar (Telekom):                 15/20/30                -/8/-/32Kb              Full                            +       -                       +/~/-/~         Flat            2 weeks
    Vodafone CallYa (Vodafone):         10/20                   ~/6/5                   Full                            +       -                       !/+/?           Paid            -
    Telekom - Expensive
    
 - Congstar
    * HSPA at home, but slightly faster than Simply (pings slightly more stable)
    * Good connection in the office, no connection in Kardstadt & EDEKA
    * In some places worse than Simply. Generally less predictable.
 - Vodafone
    * What is CallYa Flex? Is it really available: CallYa Flex 2.25 GB for 10 EUR. +5 EUR refil? I.e. 4GB for 10EUR.
    
Plan
====
 - Confirm Simplytel cancelation (works until 30.04)
 - Order a new Vodafone CallYa number and migrate it from Simplytel (2 weeks before termination)
 - Subscribe to CallYa Flex (2.25 GB traffic, 10 EUR). Optionally we can reset the data volume for 5 EUR.
 - Use Three in roaming if UK stays (uses Telekom network). Another option is Aldi.
    => Traffic option: 2 GB Vodafone (10 EUR) + 12 GB Three (14/19 GBP) ?