IMHO : The best by far : UK Vodafone or Spanish's Vodafone (I tried them both and seem to have equivalent coverage , probbably being the same provider ) .
Other than that (I tried recently UK Cellnet , UK Orange , SP Orange , SP Movistar , BTOne ) and are kinda hit or miss . For whichever reason , they seem unable to get a GSMLock in Senegal , or Mauritania , or Gambia , while any vodafone do.
Cheers.
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